If you don’t like SpongeBob, pick a different instance, that’s federation.
To me this is like having a problem with the flags someone else has in their yard. Not your yard, not your flags. You’re free to not like their flags, but if your grievance is with the action of them peacefully demonstrating free speech, that’s a you problem.
Sure, maybe that guy also happens to work at the flag factory down the street. Probably explains why he has so many flags. Doesn’t mean he’s going to make you put the same flags he likes in your yard.
Edit: for the record, I’m not downvoting you, I think you’ve been very reasonable in this discussion
I would say it’s one of the first, but not THE first. Lemmy.world is definitely the most popular instance (to a problematic degree).
But I don’t think expressing one’s love of Spongebob inherently “excludes” anyone from using Lemmy. I don’t think the Lemmy devs have any duty to anyone but themselves. And any interest they have in user adoption is for their own reasons.
Nothing would stop someone from forking Lemmy and making an alternative with different ideologies. I assume the license would ask them to use a different name to not cause confusion, and I would hope that they don’t break ActivityPub or federation compatibility with existing Lemmy instances. But at that point, what’s the difference between a fork for ideological reasons…and just spinning up your own instance?