[m12k]

Wasn't Napster based on a central server and then a bunch clients who found each other via that server and then connected p2p? (And since the central server was the weak link that law enforcement could go after, Bittorrent evolved to get rid of the need for it). If so it actually further underscores the point about a central server providing ease-of-use and not being able to expect 'normal' people to set up servers themselves.

[Dangeranger]

Yes, and PeerTube also uses a central server as matchmaker model, but in this case the match could be made to another Federated server on a different host.