More broadly, (ie not just in relation to Cory Doctorow), I’ve seen the take floating around that’s like “hey, what the heck, artists who were opposed to ridiculous IP rights restrictions when it was the music industry doing it are now in favor of those restrictions when it’s AI, what gives with this hypocrisy?” which I think kind of… misses the point?

I've noticed that too, on occasion. I think the "hey whoa, artists are copyright maximalists now?!" takes tend to miss how artists are coming from concerns about what is morally right and how they can make a living, not copyright as a principle. The latter is, at most, a tool to achieve the former.

With that in mind, a lot of the artist outrage over AI feels much more in line with artists getting mad about, say, watermark-removal tools, or people reposting art without credit, than it does with the copyright battles of the 00s.

This says it better than I was going to.