Have you considered Cloudflare R2? It seems like that's one of the very few unmetered-bandwidth file hosting providers?

It doesn't do HLS out of the box (it's just S3-compatible storage, unlike the pricier Cloudflare Stream). But you should be able to do the transcoding yourself: https://github.com/wesbos/R2-video-streaming

Or what are some other good options for Vimeo replacements?

Wasn't that before the era of hyperscalers? Intel offers nothing of value anymore. What's to stop one for the giants from just swallowing them up like 3dfx or ATI?