I’ve heard about it but have luckily yet to stumble upon any. If you’re refering to furry porn (humanoid animal characters) instead of bestiality, I know the furry community has grown in the past few years, and imo it doesn’t seem to harm anyone, so I don’t really care. Cartoon CP is a completely different issue, and while it seems abhorrent, I’ve seen arguments that it could reduce real life child sex abuse. Not sure how true this is, but at least it’s not CSAM.
That being said, since lemmy is federated it’s much more difficult to moderate. In addition, I don’t think lemmy has strong moderator tools yet (from what I’ve heard). I know they’ve recently introduced code to identify and block CSAM before it’s posted, and I believe future improvements will be made, such as better mod tools etc. Also, part of the issue is the relatively low user activity.
My suggestion for you is to find an instance that has a rule against the types of content you’d like to avoid, and defederates from instances that allow it.
I’d love it if cars in the US got smaller again. People everywhere else in the world get by ok without having a pickup the size of a semi truck. Don’t know why it’s so accepted in the US.