I like Lemmy especially because it has not gone mainstream. I was already disliking Reddit around 2016/7 and tried to find alternatives, but nothing was good enough for me. Around 2018/9, the porn subs got pretty popular, then WallStreetBets. That brought on a massive amount of users, and the Reddit I joined in 2011 was definitely gone.
It used to be interesting, unique, and respectful.It became repetitive, predictably standard, and rude. Many subs function as low-key advertising or propaganda without users awareness. It was a hive mind. I was wanting to leave, and luckily the API fiasco happened so that I was able to find a new place.
I like it small like it is now. Users feel more familiar. Also, I love the idea of instances. If one instance has a shitty community on a topic you like, then find a community on a different instance. There's none of that BS where mods control an entire topic. Maybe there are a lot of topics that aren't popular here, so that sucks. Still, it's no worse than reddit with 1+ million people all saying the same crap I don't vibe with on a topic.