That was about fair use, and so is this in a way. Ethan debated xQc on this (don’t watch, it’s cringe) where Ethan argued that watching content on a livestream isn’t fair use, and using the same title as the original video is a deliberate attempt to siphon viewership and revenue the original video would’ve gotten.
Ethan’s content nowadays is unfortunately about drama with other content creators and apparently, the divided fanbases on reddit are encouraging their community to post restreams of his content with alternative links so that Ethan can’t profit from viewers watching his content.
Ethan is not a legal expert, but he’s actually pretty good when it comes to fair use. He copyrights his content before he streams because it’s super easy to use other people’s content without permission, so he makes it easier for himself to sue for copyright infringement. For the subpoena to go through, the lawsuit must go to the alleged defendants, which would involve Reddit de-anonymizing them.
Obviously, this is not good for privacy, but in the online creation space, there is a universal agreement that siphoning views (and even profiting from other creator’s work) is bad (JJJacksfilms used to make a whole series about this on SSSniperwolf). And regardless of this being a privacy issue or free speech issue, it has always been possible to subpoena someone online.