I'm not sure how YouTubes current existence given the past decade or so isn't a huge antitrust violation. They've run the platform at a massive loss, subsidized by their other business ventures to make it impossible for anyone to create a competitor. I can't imagine that if you propose to a VC that you need to spend hundreds of millions of dollars on building infrastructure that you will then need to run at a loss potentially for decades before hoping to see any profit it would go well.