for me: every of those systems would also be fine when people would run it #themselves, and even better on their own device (at home). E.g. twister was for me the 1st time I did the self-hosting. I could have done it before with them (pagekite, dyndns, ...), but I didn't (or wasn't motivated or had trouble). Now that I have it, I see the wasted effort(s). The distinction of #p2p or #federation should definitely be made here