For some reason, on YouTube, I see the most advertising of various products and social networks, and not cryptocurrency. Certain videos and the YouTube Channel can advertise cryptocurrency, but not advertisements for YouTube itself.
It probably also depends on the people setting up the advertisement campaigns in the first place. If they prefer Youtube over other platforms, at the end they are the one who decides - It depends on which one gives them the best results.
The thing here is also that the higher Bitcoin's price is the most campaigns of that kind you will notice, because it's obvious that the money will flow towards this movement lead by those impulsed by a "Gold Rush" who try to make a quick profit. The thing here would be...When to sell?
They will find the answer to that question pretty difficult to find. It ends up being a guessing game.