The only con is that it is a Google product that could be deprecated at any point in time. But, with all the acquisition stuff happening over at RS, I'd be lying if I said I wasn't worried about them killing of their cloud offering.
1) Google Cloud Storage can host static websites:
https://cloud.google.com/storage/docs/hosting-static-website
2) Google Cloud Platform has a 1 year deprecation policy, which would never happen with a product that so many companies and customer rely on (Google Reader had a small but passionate base)
Disclaimer: I work on Google Cloud Platform
Also just wanted to say that I've been extremely happy with GCP thus far and all the services I've tried thus far have more features than RS. I really hope GCP is here for the long haul.
Disclaimer: I work on Google Cloud Platform