Google's extension to copyright and lack of accountability is the only thing broken here. That, and the fact that they have multiple monopolies.

Boycotting Google is the only way to go. One can also advocate for regulation in this are.

As for your question: They can put the video in Nebula or Patreon, for instance. Maybe there can be more of those, perhaps for music teachers. Maybe that's also an opportunity for someone new to jump into the streaming game and provide some competition.