Telecom is a natural monopoly: even if you’ve got 6-7 companies marketing to the public, chances are only one of them is actually running the lines (maybe two, if we’re talking about both fiber and coaxial) and the others are just resellers. In other words, the competition is kinda artificial since the one with the infrastructure should (in theory – barring regulations disallowing it) always be able to undercut the others, who are just middlemen taking out an extra chunk of profit.
Although I guess you could argue that deregulation is better than the regulatory-captured status quo, fully regulating the telecom provider as the monopoly it is (if not nationalizing it entirely) would be inherently more efficient.