Possessors of contestable market power or monopoly can be assumed to either not act against consumer interest or to be about to lose said market power or monopoly.

FORBES: Google, Microsoft, Apple, Facebook: Please, Will The Regulators Stop Worrying About Monopolies?

More likely, their longer-term growth will bump up against the ceiling of a European market in which the contestable low-cost segment is smaller than it is in the U.S., and well-established packaged-tour operators and national-flag carriers can block deeper inroads into the leisure- and business-travel segments.

FORBES: Magazine Article

Another way to put this is that Google has a contestable monopoly and thus should be left to regulation by the marketplace: by people contesting their market and provision.

FORBES: Links 10 Oct: Have Newspapers Gone Crazy Over Google?

Having uncontestable market power, an uncontestable monopoly, might well be: but the crucial point is whether they are contestable or not.

FORBES: Google, Microsoft, Apple, Facebook: Please, Will The Regulators Stop Worrying About Monopolies?