Doesn't every CDN already accomplish the same functionality with multiple origins and failover detection, while accelerating static content by caching it at the edge? Given how cost competitive CDNs already are, I don't see how they can charge a low enough cost in comparison to be compelling, while still incurring bandwidth costs and at least some network infrastructure which make it almost as expensive to run, minus some caching nodes. And if for whatever reason, there does happen to be some use case for anycasting the IP that's advantageous, any CDN could add this feature overnight while having a much more established footprint and infrastructure in place.