How much of Google's cloud stack are you required to use to apply for this program? If they require you to use GAE for your backend for example, I think it's going to be a dealbreaker for a lot of startups.
"Supported distros include Debian and CentOS."
Apparently not. This seems quite limited.
For everything that GAE can't do, we have a GCE instance running to handle it.
For example, if you're pulling 50 MB from an API that doesn't allow multi-part downloads, you can't do it with GAE because they have a 32 MB limit per connection.