Good for privacy! But I really doubt it would work for all recognition systems.

Some funny pitfalls that may occur - Self driving cars would prefer to hit that person if had to make a choice between him and some other human. And, there is possibility that the Street mapping cars would not blur his face for the lack of detection.

Just a reminder that even though the tunnel itself is encrypted, the whole connection is not E2E encrypted between your remote client and the server. Cloudflare as a CDN/PoP provider can see the traffic in plaintext.

In all other aspects, this is a great solution, as we even get to use the edge caching(over top of all others mentioned above) facility - which further reduces the requests to origin server.