They now have a KV storage and a CDN, but you still have to write and upload a <20 line script to connect the two, instead of being able to just select a KV namespace on the CDN from which to serve a static site.
EDIT: The KV store does have a REST endpoint for reading values, though.. I wonder if you could use the CDN to point a domain to /storage/kv/namespaces/[site-namespace]/values/ and use Page Rules to pass the authentication headers. I'd try it, but I'd rather burn the fiver on a glass of Port.