... 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.
[Notice Regarding the Transfer of the mstdn.jp / mastodon.cloud Services] We have received several inquiries showing interest in a transfer following the announcement of the end of the mstdn.jp and mastodon.cloud services. As a result of subsequently evaluating the situation and making preparations, we have decided that the corresponding services will be transferred to Sujitech, LLC. on June 30. Thank you.