Okay, so list which websites I can use to watch all kinds of content that I can find on YouTube.

Vimeo? It's basically dead. DailyMotion? It could've been an alternative, but they've recently deleted most old videos. Peertube? Nice idea in theory, but lack of content.

I was going to try to make the monopoly argument but then realized I only think youtube is a monopoly because I don't use tiktok.

It is just an oligopoly like most other sectors.