You can actually fine-tune or even train or re-train local models.

Not everyone is doing that but a everyday bigger amount of people is doing so. And whoever that do that is because they want a a model tailored to their needs, that may be too hiperspecific.

Most of these AI-bros do use local AI so they don't have to pay for it. And in the same line, if they're "AI 'artists'" (although the correct name would be AI-sloppers), they're gonna train or fine tune these models with whatever they want to, without any permission, then they're gonna sell the resultant collages (literally, collages) on internet while robbing other artists work.

I have suffered that (I'm music producer and I have listened to plenty of literal fragments of music I have manually produced inside and output of some "AI 'musicians'", and the worst part is those songs were WIPs I showed to some friends in a private group in Discord). My best friend too (he's drawer and, again, he has seen literal fragments of his drawings, but also of drawings from artists he follows, and again, these drawings were only shared in a private group).