I doubt they could present their services as public. Though who knows; with the political power gained from owning most of the communications industry, they might even be able to stand up to the U.S. government. For this reason: I imagine that any trustbusting attempt on the part of the Federals would be wildly unpopular with the people. Think about it. If you busted 'em, what would replace them would be sub-par competition techs. So like I said, wildly unpopular with the people. Not that that would really change anything, but it might.
Anyway, I'm rambling. Yes, I think they would be a trustbuster target.