Im guessing the intention wasn’t that Disney would actually sue them in court but just getting it blocked automatically in YouTube, etc
When you look at it from a legal "use it or lose it" and corporate risk perspective it's quite surprising that Disney didn't even sent cease and desists.
Edit: Of course you don't lose the copyright but your ability to litigate someone else's unfair use is a lot weaker when their lawyer can trot out a million examples that you were fine with.