Unless they went to PieFed - which many did - and then it would look like a net decrease on those charts for Lemmy.
OpenStars
Mbin has <1k monthly active users. Kbin has <100 total, and if you dig deeper, only one server (in Poland) self-reports as using Kbin.
No PieFed is not included in "Lemmy" in this software b/c it looks at the software that the instance reports as using.
Even Lemmy is not in the millions, its peak was ~55k MAUs somewhere in Spring of 2024. Well, the "posts" counts could be in the millions (according to the Lemmy stats page it was 12.2 million a couple months ago), but those stats can be fairly misleading, so I typically only ever go by monthly active users that seems verifiably closer to what people actually see happening. e.g. so very MANY people have alt accounts all across the Fediverse so the total number of accounts is highly misleading, but the number of "active" ones seems more reliable? (even then it could be an over-counting, especially if bots are active and being counted as well)
40k MAUs is barely even a highly active sub over on Reddit.
Even Mastodon only reports ~700k MAUs, and falling, though at its peak it was closer to 2 million. They really dropped the ball on making the software easier to use - unlike Lemmy (and Mbin and PieFed), each Mastodon instance does NOT show posts from other Mastodon instances, by default - or at least that was true for an exceedingly long time though I thought it was going to change this summer iirc? Maybe that change only affected "searching" for posts though? I don't use Mastodon so don't really care - but I understand why people prefer BlueSky, b/c for them centralization is the point, if that is what it takes to make the software actually work.
A LOT of the criticisms that people on Reddit have about Lemmy actually pertain to Mastodon rather than Lemmy in particular.
The entire federated concept really was not ready for mainstream deployment, at the time of the Rexodus. We here are those with the "early adopter" mindset, which is very much different than the mainstream normie one.
Lemmy, Mbin, and PieFed - they are all "good", but yeah, me too :-P
I just mentioned this in another comment but I'll add it here so you can see it more easily:
25-fold iirc, b/c on the one hand it uses a LOT less data per post, plus it shows 5x more posts by default, so less need to paginate and such.
Here is a post describing that in detail: Comparing network utilization of Lemmy, Kbin and PieFed
25-fold iirc, b/c on the one hand it uses a LOT less data per post, plus it shows 5x more posts by default, so less need to paginate and such.
Here is a post describing that in detail: Comparing network utilization of Lemmy, Kbin and PieFed
So Piefed sends me a PM when actions have been taken against my account/content?
Honestly I do not know - Notifications on PieFed, along with searching, are both features that are still a bit wonky and behind everything else. Side-note: you will legit want to keep your old Lemmy account, and use it especially for searching for content, and also if you choose piefed.social whenever that goes down for upgrades, which it does far more often than a normal instance (it literally says that btw, it deploys new features sooner than other instances so it is the "test bed" to try them out:-D but if that bothers you then use one of the other ones like piefed.zip, piefed.world, etc.).
So that one may be a bad example for me to use... but on the other hand, Lemmy has been out for YEARS and that feature requested for YEARS, whereas PieFed is still being built and new features are added WEEKLY. So I would expect to see that feature "soon" on PieFed, whereas on Lemmy I would expect to see it "never" (b/c of the authoritarian mindset precluding them even wanting to do it). Just like so many other of the continually growing set of features offered by PieFed.
Not to get too deep into the tankie bashing, but nevertheless it does seem worth pointing out that the philosophies of the Lemmy devs have gotten them into some financial trouble, as people do not want to interact with them, e.g. to first learn the super-difficult (even compared to C++!!) Rust coding language and then try to contribute code. In contrast, pretty much every programmer already knows Python and so a lot of people can - and do - contribute to PieFed.
TLDR: PieFed is so much newer than Lemmy and honestly it is a bit behind in some ways, but even so PieFed is already running circles around Lemmy in not only the pace of development but also the raw set of features already developed.
And if I can add: even Reddit stopped adding features YEARS ago, unless you count things like those Doge coins that generate profit for the company but do not add anything new to the user-base. To see a thread-based forum platform actively adding brand-new features... damn it is so refreshing! (and yes Lemmy does that too, but on the scale of YEARS rather than, again, mere WEEKS)
I don't rightly know but... to a first degree of approximation, if both are fully compliant with the ActivityPub protocol then why would it? (they are not I would guess, but that is a more nuanced take than I have knowledge of:-D)
It is the same set of considerations that govern Lemmy instances: the admins are irl people who have whatever ideas they like to see happen in the world, and it's their personal machines and effort that they are putting into administering the instance, so they get to do whatever they please. If you like those philosophies (which they tend to say in their sidebars), then you can make an account on them - FOR FREE - and if not, then you are free to go elsewhere.
Fwiw, piefed.zip avoids defederation as much as possible iirc and has an affinity for gaming topics, piefed.social is one of the oldest but note that it tests deployment of all the newest features, so it can break more readily than a more stable instance, piefed.ca is located in Canada and geared towards people who live there but like the Lemmy version, all are welcomed, and piefed.world is run by the same admins who handle lemmy.world, with all that that entails - some people love that fact, others will hate it, and again it's all fine and good bc there is room for us all to coexist peacefully across the Threadiverse:-).
Yes the lemm.ee switch-over crowd is over so it will be interesting to see the more natural growth after that.
e.g. from January to March PieFed (edit: 's Monthly Active Users) more than doubled in size long before lemm.ee's troubles were widely announced.
Typically as people hear about the new features and are astonished by how PieFed offers exactly what people have been outright begging to see brought to Lemmy (heck, in some cases even Reddit) but they simply won't do it. In fairness, perhaps they cannot, given their current pace of development, but also their prioritization may differ from those of the end-users (I have noticed that particularly things that involve federation between instances - e.g. modlog actions - typically receive much lower prioritization than things that will work inside a singular instance, perhaps reflecting the bias that the main Lemmy devs are also the admins of their own personal instance? for good or for ill, it is what is is: this is their platform, and if someone does not like it then they are free to go ahead and make their own from scratch, which both Kbin, before it was forked to Mbin, and now PieFed have done just that:-D).
I love it too, but it is something that does not happen "naturally". A lot of people feel intimidated by e.g. someone spinning up a bot that will send 20-100 identical messages at someone (yes that's a real story that I was reading about earlier today), and while that one is on the extreme side, more mundane methods of trolling work almost as well for a fraction of the effort.
So thank you for your efforts to resist the trend and create a space where people can actually enjoy things:-).

Many of us stopped actually "engaging" on Reddit long before we finally left it - the amount of trolls just waiting to pounce on anything at all that was said just got too damn high!
There are (so MANY!) trolls here too, but you can block them all and then breathe an enormous sigh of relief and finally enjoy the rest - I am saying that here that is at least possible, whereas on Reddit it just simply was not.