... likely see a reprise of business practices and behaviours during the monopoly-forming period of the early phone system. That will include gamesmanship over protocols, patents, backplanes, and last-mile connections. It's going to be really ugly, probably for a decade or two.
(Assuming there's anyone to connect and any technical way to do so.)
Another possibility is some sort of distributed mesh federated system. I'd like to see that, I have my doubts it will scale particularly well.
Generalistic and moderated instance.