I self-host my blog on a server in my home. Instead of opening a port to my home network, I'm using Cloudflare Tunnel to expose the blog to the internet.
And besides, Cloudflare Tunnel is distinct from (though it integrates with) the cdn product.
It certainly isn't.
In fact, IPv4 is the de-facto authorization and authentication system of the Internet. It's stupid but it is what it is.
Cloudflare is the "bitcoin mixer" for laundering IPv4's.