It's a cool idea, but has Google actually guaranteed any certain level of support? What if someone ends up creating a site with a huge amount of bandwidth, and

It's a cool idea, but has Google actually guaranteed any certain level of support? What if someone ends up creating a site with a huge amount of bandwidth, and then Google pulls the plug? I know that the offered amount of bandwidth is drool-worthy, but realistically how much of it can be used without drawing the ire of Google and getting shut down?