On many ML posts, you get arguments about IP, and there's a long history of IP wars on this forum, especially when licensing comes up. Then you add the popular

On many ML posts, you get arguments about IP, and there's a long history of IP wars on this forum, especially when licensing comes up. Then you add the popular Big Tech Is Evil arguments you see. I think it's a variety of factors coming together for people to be upset about someone else profiting from their own work in ways they didn't mean to allow. I expect that we'll need new copyright law to protect creators from this kind of thing (specifically, to give creators an option to make their work public without allowing arbitrary ML to be trained on it). Otherwise the formula for ML based fair use is "$$$ + my things = your things" which is always a recipe for tension.