Another example on the opposite end is a host like Hetzner, where you get 20TB of traffic at 10Gb/s uplink for any cloud VM at $5+/month (or any root server at $40+/month). Comparably, AWS EC2 is $0.17/GB IIRC.
On another note -- it looks like Vimeo are using Akamai.
Bunny CDN would give you 2TB for about 20 bucks/month.
I know you'd then have to use your own website/player but that's not really a big deal, most people that use Vimeo have a website anyway, it's not that hard to code an <embed> tag ...
I don't think this was a good move by Vimeo, but maybe they're doing so bad (financially, as I think their product is great) that they don't really have a choice.
I really think this shift is not smart one for them. Because these creators will move especially once they realize they would pay 3usd on cloudflare. And cloudflare/bunny smartly include pretty similar upload area and even videoplayers/iframes so there is not much difference to vimeo for these "creative pros".
Netflix doesn't stream content from AWS, Vimeo needs a more cost effective architecture.