I know Three arrows does some sort of podcast patreon subscribers can listen to, so maybe that's where they are getting their money's worth?
I think, in some cases at least, what slows videos down is the added quality of research or production most creators invest in after getting popular. In many ways it's also the creative mind sometimes needing some direction a producer gives in general media, and not having that lets them just go absolutely wild is useless work that ends up being scrapped. I might be a bit charitable though because I only followed a few breadtubers, there may be many more that are just grifting.
Personally what intrigues me the most about breadtubers is how they become mild and inoffensive versions of themselves after becoming popular/well-off. Like, what causes that? Is it that the societal problems they criticized no longer applies to them? Is it the allure of advertising money? Is it secret CIA threats? I really do wonder.
I think Shaun still keeps to the same type of content, which is probably why I still bother watching what he puts out.