Luxottica can be fought with ZenniOptical and friends. Besides my very first pair of glasses, I've never in my optical-aid-lifetime given money to Luxottica for glasses/frames/contacts. That is not to toot my own horn, but demonstrate that an informed consumer can sidestep their monopoly without adverse impacts.

Comcast & AT&T are terrible actors, and they need more regulation, not less, to counter their natural monopoly + rent-seeking behaviors, but there is at least some regulation going on that could be iterated on. Google is, relatively speaking, running amok through the streets.