I have seen a few and i was wondering if its allowed or not

Probably.

There isn't a full stance on it right now, but I don't recommend uploading AI if you were planning to do so. ATM we're just deleting anything that has anatomy errors, or is poor quality.

Well, there is the instruction that discourages AI images to be uploaded here, AFAIK.

It does allow blacklist!

plz do not delete the izumi_konata image i just tagged as ai_generated it's very cute and i like it :)