This is an interesting argument. I don't think the two are completely analogous, and the whole thing falls apart once you go beyond consumer level usage due to piracy's inability to make new things like AI can. While piracy isn't going to get any game developers or musicians fired, AI image gen very likely will. The more it improves, the harder it will be for companies to continue justifying paying real artists.
That said, you do make a good point that many pro-piracy arguments can be used all the same to be pro-AI image gen. At least at the individual consumer level.
Because AI isn't creating a copy of the original thing, it is attempted to replace the original thing for a profit.
It would be like if a publishing company took some book, removed random parts of it then replaced them to parts from other books, then sold that instead of paying authors to write books.