Disney, or anyone for that matter, can copyright claim any video. Youtube just plays ball because that’s the simplest thing to do.

It’s on them to prove, in court, that it actually is copyrightable and that they own the copyright to the content, which they’d fail to do.

The win is for the uploader and for the public, since now you can “be sure” that Disney won’t take you to court over it, which would be a costly endeavor for you. Even if Disney would almost surely lose.