The other complaints are mostly about how it has become hard to not share to social media, but that's mostly a complaint about how people are.
He can still just post on a website, it's not really the fault of social media companies that people prefer that.
Their complaint is not being able to post art for its own sake because it will be hoovered up into datasets to train more AI: They are forced to submit to helping train AI or not post their art.
You cannot copyright a style. A person is perfectly within their right to copy your art style when they produce their own work. So, I think "duplicate the style of" and "taking inspiration from" are the same thing in this context.
Also, the pool of people that can imitate a skilled artist is much smaller than those who can prompt "in the style of Picasso...".