Hi. I'd like to say that i agree in what you said. That the AI most of the times is being used in the wrong way. But i'd like to add some corrections.
There is no such thing. as 'stealing styles'. Basically because the art style, like literature/movie/music or game genres are not something copyrightable. (And we can thankful for that).
What is a copyright infringement is, for example, drawing Mario or Sonic without the explicit permissions of their owners.
It doesn't matter if you are the first person in create a new art style. Let's imagine you are Studio Ghibli and you have a really specific art style. You used for spirited away. You can copyright the movie, characters, songs made for the movie, etc. But not the way it was draw or animated. Like i said, is the same with genres, you can write an horror story, but can't copyright the whole horror genre.
And about the data sets. As far as i know the real felony is many companies used pirated material to train models. But there is no law that forbid people or machine to learn from any kind of source, even if that is a copyrighted one.
Sorry if my reply is too long, i have to learn when to shut up, haha. And i am not ranting, just think many people don't understand how copyright laws work. If i am the one wrong. Please, let me know.
:-)