You're taking a specific case (low amount of data, high egress) and comparing an offer specialized for that use case (r2) with a general-purpose offer. Amazon S3, for example, would not perform better than upcloud here (I calculated $50,000), and that comparison may be more adapted.

Though I agree that neither ovh nor upcloud have an offer tailored to that use (I think in that case using a CDN instead may be the more adapted). That offer may or may not exist on the EU market but I'm too lazy to search for it

On a sidenote, I didn't know about r2, thanks for the tip