Earlier quoted context omitted.
Let's just say that the government decided in the year 2005 that no private company can ship something that will replace SMS as the defacto messaging system because it wants interoperability. We would have never had iMessage, Whatsapp, Messenger, etc. Other countries would have far surpassed us in messaging communication tech. Regulations are a double edged sword.
That's a poor option to regulate from. They could just as easily have required messaging apps to make their protocols open, allowing for competition in the app space messaging over them and not facing lock in.
Also, SMS is the open protocol so we have at least one interoperable standard for people to choose from.