Only half of the conditions
In order to have investments, you need profits, but also competition. Take TWC and Comcast: they make profits, but are not competing against each other. They are even proclaiming it: one of the arguments they are advancing for their merger is that anyway, they are already not competing against each other, so nothing would change. No competition means no need to fight for customers means no investments. QED.
On the other hand, I don't think there is anybody who would claim that Apple and Google are not competing against each other. The fight for market share is real, constant, and there is even Microsoft trying to make a viable third horse. For them, banning a network means losing users. They are unlikely to play that game.
Oh, and about Google Fiber: considering it exists in about half a percent of the US, I doubt Google can leverage anything on that front.