Lots of youtubers with Patreons do have tiered credits, with bigger doners having separate credit sections with fancier titles, and usually their names are bigger and/or stay on the screen longer, which kind of seems similar

A big difference here is that EPs on a feature can get ROI on their money. Of course the cliche about Hollywood account can play games with that, but I doubt any Patreon supporter at any level would ever start to see any kind of revenue sharing from the YouTube's monetization.

Well, you deal with that the same way you deal with Hollywood accounting: you negotiate a cut of the gross for any episodes you sponsor.

*donors

C&Rsenal (~hour long historic firearms documentaries) does

Defunctland offers EP credits but is currently sold out.