[Gimpei]

Not really... Anticompetitive would be if: 1) The entrenched players were selling at "zero profit" or price equal to marginal cost. (I find this dubious, they are monopolies after all. internet services are a fraction of the US price in many European countries) 2) Google were doing this with the intention of raising prices once all of its competitors go out of business. Since they are behemoths in their own rights, I just don't see Google having the desire to push a price war to this point.

In general "dumping" is hard to establish since no one is going to reveal their cost structure. In my experience it is normally an accusation flung by incumbents because that other guys stuff is too cheap.

If it breaks the back of the ISP monopolies and forces them into the role of unprofitable utility, all the better. That's the whole point of market forces, right?