Earlier quoted context omitted.
I’m not being defeatist. I’m literally just pointing out the reality of consumer trends. There is oodles of research into this topic. It isn’t something I’ve just made up. It’s why analytics exist to explore website user journeys and then promoting the most important calls to action in prominent places. It’s why physical store fronts put the doors at the front of the shop rather than on the side (side note: a friend…
You are confusing "optimal" with "feasible" and you are ignoring the fact it can be more profitable to serve a niche (people with a minimum of ethical standards) than to be just yet-another participant in the commodity marketplace.
The problem isn’t that other revenue streams don’t exist. It’s that they’re still dependent on the whims of YouTube to get their brand out.
And unfortunately, these other revenue streams are only more profitable than YouTube for the smallest percentage of video content creators (baring those who specialise in adult content, but that’s a whole other domain of content creation ;) ).