this post was submitted on 24 Mar 2025
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As much as I hate to be that guy, it's worth keeping in mind that BlueSky is not really practising what they preach here. The AT protocol formally allows for a kind of decentralization, but it is prohibitively expensive to run an instance, meaning that only rich folks or those who are willing to accept money from venture capitalists will be capable of actually doing so.
ActivityPub already existed when they started BlueSky. They chose to not make their protocol compatible. The reason is simple: They are a company, and they have a profit motive. ActivityPub is too democratic, and therefore hard to monetize. By now they have a bunch of crypto bro investors who want their money back. It's better to leave your money elsewhere.
I obviously support ActivityPub or I wouldn’t be posting this here but one of the AtProtocol developers bought a Raspberry Pi with 8GB ram and added an NVME drive. He’s trying to prove (or possibly make) this point wrong. https://bsky.app/profile/why.bsky.team
So far, it seems like it’s “working” but he’s found some things that are way too slow and needs to be fixed for it to run on a Raspberry Pi. But that gives me some confidence that the developers, at least, aren’t trying to make it so only people with deep pockets can run an instance. (I don’t know what the investors want but the developers aren’t scheming assholes.)
It’s probably going to ultimately be a situation where anyone with a high end PC (by today’s standards) can run their own instance. It’s definitely not an A.I. situation where you have to reopen Three Mile Island and piss away more water than Nestle to self-host.
Because of how Bluesky is designed, to meaningfully federate, your server needs to ingest all data from everywhere, and every new message needs to be sent to every single other federated server.
This means that Bluesky just isn't set up for federation currently: it scales quadratically.
Self-hosting a PDS is not the same.
https://dustycloud.org/blog/how-decentralized-is-bluesky/
I'm glad to see someone attempting to run their own index but the protocol is not meant to scale that way, and it gets worse the more indexes there are.