I host one but the more I analyze privacy implications the worse it looks.
Only you and maybe 10 other people will connect to that server's IP, port 5222. This makes it very easy to track your group by telco operators and people who have access to their logs.
Even if you use a VPN or Tor at all times, most of your other users likely don't.
And the domain is registered to someone's name too, although I know this can be worked around.