I just stumbled over that service: pbn.hosting
They serve static html content which is distributed over a content delivery network, probably Amazon Cloudfront. They claim to have thereby more than 300K IP-Adresses, but the fundamental thing of a CDNs is that in most cases the nearest server is returned. This is also what Amazon says, what is the truth for all CDNs.
This would mean that G bot would see mostly the same IP-adresses for ALL blogs hosted there, correct?