I want to thank @hermeslispegistus for bringing up the very valid issue that Mastodon's burgeoning popularity may damage the federated system. The responsible way forward is to promote federation in every way that we can.
@kadybat I think the ISP problem can be solved by separating the companies that do the physical infra, and the actual internet service on top of that.
As long as "anyone" can offer services on top of the physical cabling: Problem Solved(tm)