When talking about the concept of monopoly, it's quite relevant which part is under discussion. For example, a lot of video content I consume is from Instagram or TikTok. This stuff is real and it counts. Creators there often have little to no YouTube presence, and are relying on their platforms for the same question of discovery, and your claim about 99% of their revenue simply isn't accurate. This is a quibble, except for the fact that when we're talking about
monopoly,
every exception counts.
"If you want to make a living, you have to host on YouTube." If you want to short-circuit a lot of the work of audience development by having a recommendation algorithm point a firehose of eyeballs at your stuff, you have to host on YouTube or a comparable platform. However, that is a very different thing, and not a technicality at all! The business model of a YouTube creator is precarious and contingent, because their relationship with their audience is so thoroughly mediated by the platform that the platform's whims give and take away. ("Hit the bell so you don't miss a video") Essentially, there's a risk of taking the dependent-on-platform-aspect of this business model for granted in a way that obscures the alternatives people really do use these days. (E.g., I know we probably all hate those Wordpress sales funnel things, but from the perspective of "how do I make money from my content" they're genuinely an option we should be contrasting here)