Hmm we got the internet and cellular phones because AT&T were broken up? Citation needed I think. That sounds pretty far-fetched and over-reaching to me.
somewhat later, these same people were responsible for nonsense like ATM. they were going to prop up their own internet - with hookers, and circuits, and per-cell QOS based charging. and they were gonna do it right. and it was gonna be great.
would they have leveraged their monopoly on the underlying circuits to try to dominate layer 3? almost certainly.