I'm not so sure. Communication tools are fundamentally different than most other products, because their primary value is the number of other people reachable through the service. This isn't true of most other industries, where you can drive a Toyota and I can drive a Ford and everyone is happy.

When your a whole market is based on the ability to interact with other people in some way, and a single company can flip interoperability on and off like a light switch, it has the potential to be a dangerous monopoly. The government stepped in and broke up Ma Bell because of this.