The user is definitively making an error here. Especially when the user is actually not a user but a producer (supposedly artists). As an artist you should strive to have a certain level of ownership and independence.

It gets worse, there was a thread a couple weeks ago about Envato (ex ThemeForest) asking all their authors for "free/unlimited" rights for anything they have to be used to train AI models for NO compensation. It was eye opening how many "artists" and "producers" accepts the status quo as is, and think it's still a good idea to collect whatever this company throw on their way.

It's really hard to feel sorry for these people...