Several users already provided access to "their" server, like me at some point I had one up at "superpowers.florentpoujol.fr:4237".
I guess what's needed (and what I wait for) is an authentification system more advanced than just a global server password.
It will come later and I will definitely put my server up again, but it's not necessarily a good idea to rely on other people's server because if the one you use is down you are screwed.