I'm in various FGC circles, and when Twitter had... I don't even remember which of its many controversies, it was a few years ago, but something or other resulted in fgc.network being launched and I immediately signed on to the idea of a federated alternative that no CEO can destroy.
At the time I also did peek around some of the other parts of Fedi, uploaded some of my Splatoon stuff to PeerTube but it was a complete ghost town. My first impression of Lemmy was that it wasn't there yet, not enough critical mass.
Then Reddit had its API debacle, and I decided to commit to trying Kbin for a while, for at least as long as the blackout lasts. My impression was still that it wasn't ready to replace Reddit, that it unfortunately can't replace the kinds of niche hobby and fandom communities I used Reddit for, but I thought Kbin's software felt like it had more potential, and I would stick with it. Then the Reddit admins turned sour, the sub I moderated that participated in the blackout had our mod team threatened by the admins, and I knew I was just never going back to Reddit.