my source for the part you quoted - apparently this is in their dashboard? it could be a third party site. I no longer have access to a twitch account (as an aside i blame starlink and not using gmail) so i can't verify if streamers on the platform have access to those tools.

And the pricing seemed about right. You can't tell but i am napkin-ing this right now: twitch recommends 4500kbps for 1080p30 on the uplink side, which fans out to 40gbit. per second. So maybe you can get that for $5000/month; or you can get 10gbit links in four places. Receive bits, transcode, stream. how hard

wait transcode?

A certain very large media company was paying a third party $250,000 per month for transcoding, on three 24x7 streams. I'm not saying that spend was necessary, because it isn't, just that it is a pain point.

anyhow that video shows $0.132 per half-viewer-hour (or something) at 1080p - probably 60fps. Come to think of it that's suspiciously close to what i'd guess AWS would charge for transit (which you alluded to, i think) - so this is showing streamers what they would be paying if they self hosted?

So the cloud providers tend to be the one's paying and consequently their legitimate customers pay.