They're under the encouraged belief that they are in control over what is shown on their youtube channel. They think they should control what text is shown under their videos on "their" channel. This illusion of control of presentation has been unconvincing for quite a while but now Alphabet is just throwing around it's weight because there are no other options except youtube for what youtube does: allowing money to flow to people who make videos without the video file host getting sued out of existence. Alphabet does this by mantaining a large standing army of lawyers and a huge money supply. Trivial technical issues like file hosting and network bandwidth have been repeatedly solved by others but when they become popular they're legally attacked and killed.