Similar to the music industry piracy battle, it makes more sense to work with the big platforms than fight them.
This may be the right move but it's by no means forced.
When music piracy was facilitated by corporate entities like Napster, the rights holders sued them out of existence, after which piracy evolved into a highly distributed problem that was too costly to prosecute (you can’t sue everyone using BitTorrent one by one). Yes, eventually the music rights holders did facilitate commercial distribution, starting with the iTunes Store, and it was successful because they satisfied the market’s key demand that customers be able to buy one song as a time for 99c, as opposed to the whole album, which would often cost upwards of $10. Also, they didn’t let customers modify the songs or make derivative works.
Generating Disney-derived content with AI, on the other hand, requires massive resources that most individuals don’t possess, thus making corporate entities all but essential players in the game. (This may change in a few years as technology improves, but we shall see.) And we’re talking about derivative works here, not mere copies.