LBRY and Bitchute can automatically mirror your YT channel, and IIUC the former can also automatically upload videos to YouTube, maybe even on a customizable delay. Some decent sized channels like minutephysics use LBRY, but even though anecdotal accounts report much higher revenue per view and no decrease in YouTube exposure, it’s still certainly a uphill battle to compete with a de facto monopoly that can afford to hemorrhage money and just get more from a massive gatekeeper of the web.

Would you risk losing ad revenue if you posted to content providers who pay less?

(I have no idea whether YT revenue is meaningful for smaller players, to be clear; I suspect not, but I also suspect it's worse elsewhere.)

I'm pretty sure Vimeo is paid, so it's sadly a non-starter for many creators.