I already use those things. My main way of watching YT is with Tubular.
The problem is that there is one, centralized hosting provider with an all-powerful, non-customizable (by the user) recommendation algorithm. That algorithm, like it or not, dictates the type of content that is made on the platform. If there is content that Google doesn’t like, they can (and have) very easilly shadowban the content, meaning only people who specifically search for it will see it, if not remove it altogether.