Maybe there could be a search engine that finds videos on all video sites, and shows them according to some well-tested algorithm, without any bias? Oh, but the owners of such a search engine would need to be entirely neutral and unbiased. For instance, they should not also be owners of a video site that they would like to promote.

It's been a long time since the USA Justice Department went after a company for having a vertical monopoly, but this is a reminder of why vertical monopolies can inhibit innovation, just as much as horizontal ones.