Ooops, I'm kind of in the same boat as the first described user. Having videos behind a custom paywalled website hosted by vimeo. Looked at analytics right now, 12k minutes played and 200gb transferred in the last month, let's hope that does not put me in the top 1%, I don't want to be forced into a painful migration to something like cloudflare stream.
Edit: I'm paying for the "pro" vimeo option currently.