I’m glad that this is the controversy on Lemmy, and not things like Reddit had with r/JailBait.
Lemmy already had a round of that, specifically over loli. It’s why a lot of instances block burghit.moe - they don’t ban loli and have a few loli specific subs.
The only other Lemmy server I know of that allows loli subs is the rad queer one and it’s tiny and also blocked by many other instances, though I don’t know if that’s for the loli or the general rad queer thing. Really, likely both.