Vimeo has an “uploader pays” system (of sorts), and, while it prevents garbage on the platform, it stops creators from wanting to use it when YouTube is free.

Yes. It's of course a perfectly valid (and widely-used) model to pay for hosting. But, by and large, only "serious" users who probably otherwise have a business model will do so. And there will inevitably be far less content on the platform.

On the one hand, I think it's sort of unfortunate that so much of the Web has come to be about "free" access (though paying for access with attention and time) but that does come from the perspective of someone who would be able and happy to pay with money instead.

It's expected because the expectations are set by the existing platforms. And the reason why Google specifically is actively promoting those expectations, is that it makes ads the only viable business model for content creators; and Google's primary source of income is their ad services, so it maintains their dominant market position.