The polarization isn't about income models, it's about the different kinds of content (light hearted safe content that aligns with advertisers vs extreme content that doesn't). I may have confused things by mentioning gain. The different goals of the creators was just my basic explanation as to why similar content continues being created because the effect is already in place.
I find it disturbing that you disregard the effect of capital. Advertisers are 100% focused on monetary optimization, and they're very good at driving creators to what will work best for them.
Of course content and context is important. But, money drives the content creation. Even when it isn't used to pay for the original content. Advertisers want impressions and clicks. Content creators want more viewers. The type of content aligns with advertisers goals -> money becomes involved -> more similar content. And other creators see this and want part of it.