OC please steal
Well, Linux is 32 years old; GNU goes back to 1984, and Unix all the way back to 1970! The history of this OS is much older than Linus Torvalds's involvement; he "only" created and maintains the most popular kernel.
But yes, happy birthday to Linux. Many thousands have contributed to making this operating system what it is today and they all have my utmost thanks for it.
Most of what you can do with Debian and Fedora, you can also do with Mint. You can even install KDE on Mint, and configure it however you want. Debian is a bit nicer to customize, though, because it's extremely stable and most of its apps keep their "vanilla" configurations, or at least a configuration unlikely to cause bugs.
F-Droid is the more valuable app store anyway. I always check there before Google Play.
Going by their Mastodon account, seems they were erroneously detected as "from a US-sanctioned region" and it took too long for said error to be resolved, so they just made the switch.