Different markets. Film (90m+), TV (40m) and streaming (...) have all found their own markets and as such managed to not be captured to the youtube platform. Not to say that Youtube has not tried, with both youtube red and streaming existing on the site, but they have not been that competitive against established players in those markets.

Not sure how those two compete...at all. This point actually works against you, because using momentum as a good, Netflix beats YouTube on movies because of their momentum in that category.

Which is why a big service like YouTube can't just walk in and steal their thunder. Kind of proving the point that critical mass in internet technologies is a type of good or "moat" that could, in some views, count as a monopoly.