Youtube is a monopoly because it's not a very good business to be in and it basically lives off Google subsidization. It has plenty of openings for competition and none have too much forward movement.
YouTube made $50 billion last year - I wouldn’t call it subsidized
revenue or profit?
Revenue. From earnings release for 2024 Q3[1]: "YouTube's total ads and subscription revenues surpassed $50 billion over the past four quarters". 2024 Q4 says: "Together, Cloud and YouTube exited 2024 at an annual revenue run rate of $110 billion."