Arch linux user here. Gaming totally works. Sometimes even better than Windows when playing native games. Even Proton works good most of the time. Sometimes I play Brawlhalla with Proton Experimental and it runs better and less laggy in Linux than Windows despite Windows having a native build. Check ProtonDB to find out how well games work on Linux. Linux gamers review games there.
Thanks to Valve, the Steam Deck is getting Linux popular and basically makes devs build their games for Linux as well.
Bluesky is not a part of the fediverse. If they don't want to use standards and the devs cry about how it is absolutely impossible to integrate the features of ATProto into ActivityPub, then they can fuck off.
That happens because you didn't include https:// as a prefix in the URL.