Because Content ID was built following a $1B lawsuit by Viacom regarding copyright infringement. Google doesn't have an incentive to build something similar for creators until some celebrity or large corporation starts suing them for using famous actor's likenesses. YouTubers alone can't fix this because they make too much money from YouTube to be able to take a stand (such as move content off platform to Nebula or the like).

That’s what I thought, Google can, but won’t until required to by law. And so, we need a law to require them to do so.