"Caves" is doing heavy lifting work here. Censoring a president should come with repercussions.
So, legally YouTube is fine, politically things are different.
This is a matter of Google saying "he can do more than $25M of damage to us if we keep fighting this".
Seems plausible.
Sadly this is also why no matter how corrupt Trump gets, his base won't abandon him. The God Emperor can do no wrong.