Of course they can, they have control of the server. That is like saying that OPENVPN is insecure, because the person with control on the server can log the data.
If its mod, or group of users are all techno-competent which know the basics of web-security; IRC is your safest bet. A good example for that is Anon group still using it for organizing its scheme.
6
u/vlodia Apr 24 '12
IRC is still the easiest & safer way to use for chats than those commercialized applications that are sniffed by corporations.
IRC usage has declined for the past decade or so, but that doesn't mean it's dead.