YouTubers profit of US, the viewers. We buy their overpriced merchandise, we religiously watch their ads and their sponsorships. Heck some people even go further and crowdfund them through patreon!

They're not bourgeoisie (tho their lifestyles are as opulent), they're merely jesters of our time, they have huge incomes because WE crowdfund them in exchange for entertainment.

The platform, the ad companies, patreon shareholders are the capitalists. They take a cut from every content creator income.