Hm, I don't know. 2020 is still pretty recent! I imagine a game has to be around for a bit of a while before a modding scene can appear. And the game has to be popular enough to for there to be a "scene", but the long tail keeps getting longer, which makes it harder.
I remember reading somewhere (I wish I could remember where) that more complex games are by their nature less friendly to modding, and companies that used to facilitate it don't bother doing it anymore.
One could maybe suspect corporate fuckery, but that could easily go in the other direction ("oh yes make mods, but first sign this little contract, don't read much into it...").
There are things I don't like about Lemmy, but they are minor, not much of an issue. I don't understand what good federation does here, but it does no harm either. It's very light, I love that aspect. I tend to prefer traditional forums, but not all of them are good. Some are terrible, like they're trying to kill off forums, hahaha!
But for me, personally, Lemmy satisfices, and it's already in place.
I have tried Matrix once, didn't like it. Could change my mind about that. But what would it be like? I need some structure, and I'd probably run away from something more chat-like.