This system could work if the people who manage anime communities also enforced tagging borderline hentai with the hentai tag, which hopefully most wouldn’t take issue with. You could always still block the community/instance if they don’t follow this system.

Personally I’m not interested in hentai or anime, which is why a general anime filter encompassing both of these themes would be perfect for me.

Alternatively a filter for “hentai” and a more general “anime” filter would also be nice.

That’s reaching a quite a bit. Reddit itself is very left leaning. Pair that with the fact that the (probably few) ring wing people leaving Twitter recently might not be interested in a forum style platform such as Lemmy.

My guess is that the number of right leaning people joined Lemmy in this last wave of new accounts was small in comparison to the left leaning ones.