I feel like you're incorrectly equating ponychan with other chans.
Sure, it'll rot you inside if you spend lots of time on 4chan, because it's a fast-paced site with infinite content and infinite angry nazis. You can absorb hate and sloth for years on end there.
Ponychan is not only tame in community, but it's so slow that it can't
take up much of your free time. There just aren't enough people to talk to. Makes it a pretty healthy hobby... like, I've tried to get addicted to ponychan, it doesn't work.