I built the same thing and then just realized that I built a marketing funnel for Cloudflare lol. It's why Cloudflare is trying a bunch of different approaches to the same thing, they're the only ones that actually benefit from it because you can't actually build a business off hosting millions of sites on cf pages, it's a loss leader for them to convert you to a paid product if you end up one day getting a lot of traffic

Hosting a static site isn't free, they just don't charge you for it early on