If you don't use YouTube, you're also screwing over the content creators you enjoy. You can cause harm to a company in many ways. Stop using a site prevents them from making money off of you. Preventing them from actively making money off of you while you're still using the site actively takes money away from them. It is double sided sword because you're also not actively supporting that content creator. However, if they don't have another platform to post on, you can instead buy merch, donate, or simply help the algorithm boost their content by watching their content.

I don't disagree with you. YouTube should no longer be a viable business. Something else should step in and rival them. But since that doesn't look like it's going to happen, I'll be happy running adblocks, and letting them not recoup their server and operation costs from me.