Google will simply prioritize bandwidth of its services to IP blocks by **revenue**. When your ISP's revenue numbers plummet, so does the bandwidth / latency for your ISP's network. As ISPs are rated by customers for providing service, this will lead to competitors that are more neutral to be preferred among customers. Imagine the scenario of two strangers on a bus, one of which using ISP A seems to have an outage with Google Maps or News or Mail or YouTube because his service filters content and Google restricts bandwidth or adds noticeable latency as a result. The other uses ISP B and they have _fast_ access to all of Google's services. Both customers pay their ISPs. Which ISP serves their customers better?
Suppose that that's not enough to get the attention of ISP A - suppose the added latency / limited bandwidth difference doesn't cause customers to call the ISPs customer service hotlines over and over again complaining about performance of YouTube and Gmail and Maps, etc. Google could then add a warning message to its services: "ISP A is filtering your access to Google services. We recommend you find another carrier that does not filter your service. Here is a list of ISPs in your area sorted by Google's performance measurements: ISP B - XXX GB/s, xxx ms avg latency, ISP C - YYY GB/s, yyy ms avg latency, ISP D - ZZZ GB/s, zzz ms avg latency."
Netflix didn't have the balls to do that, but Google probably does. Granted, it's not the first measure that I would expect Google to use. They do after all have lawyers. I don't think we'll get to that point. There's probably an opportunity for Google to make business deals with competitor ISP B to carry traffic better _and_ advertise to ISP A customers for a profit, so even if ISP A and C ran afoul of Google by taking that approach, you could bet that ISP B would see the opportunity to snatch customers. The difference between the Mobile carriers and the US cable and phone ISPs is that the mobile carriers overlap far more and actually have competition.
A perverse part of me wants to see some of this actually happen in reality...