I asked them once, and they seemed pretty adamant about not hosting content. Then again, with the IPFS gateway they just added, you can pretty easily do that.

Their (newish) cache API, and worker-kv API seem to be all the foundation you would need.

Basically, it feels like they would need to make a nice UI and perhaps some connectors for github, etc.

Why will someone use a paid plan of CLoudflare when Netlify is already free?

To compete with Netlify's paid tiers.