Is every node on the blockchain under your control? If so, either you have a huge network or you have a useless blockchain. If not, then it's not self-hosted.

No.

This is the correct answer. Unfortunately it's not the answer many people want to hear, and a lot of people end up going with some grifter scheme that sells snake oil. The gen AI space is currently 99.5% grift and 0.5% legitimate business.