Forbidding servers on their network is a completely rational stance for them to take.
Do you also get upset at "all-you-can-eat" buffets when they don't let you fill a barrel full of food to take home and eat later?
The comparison should rather be "Do you get upset at buffets when they don't let you have the main dish after dessert?" They use content inspection to increase their revenue.
One aspect of net neutrality is advertizement laws and clear communication between the commercial entity and the consumer. A restaurant can't just say that "its up to!" and give you a carrot when you paid $50 for a buffet, complaining that their capacity to make food is full.
If the network connection Google want to sell has direct limitation to them, Google should be legally bound to make sure the consumer is aware before a contract is signed. That is normally a basic consumer protection law in most markets, and the ISP market is just lagging behind.
Is something like a 5 to 1 over booking happening with google fiber? Overbooking is common practice with airlines and many business that have solid statistics that tell them how safe it is to overbook. It is not normally considered, when done in a reasonable manner, a scam to do so either.