There's appears to be a mismatch between their costs and their billing, which either is true and someone will take advantage eventually which will force a restructuring of billing, or it's not actually a mismatch and we're all judging a situation with not enough information.

It is, but it’s funny no one complains about per-user billing for the other products. All of these other products bill per user instead of by bandwidth and storage.

I would switch to Cloudflare Pages for a serverless setup.