the few rules the server has is to regulate things like propblock (no excessive blocking, one entrance that has a single layer), propclimbing, that shit. The only rules that exist are to regulate game mechanic and map exploitation.
when people say no rules they refer to the fact there's no (or heavily limited) rules regulating player interaction.
as in the second i get a beanbag shotgun i'm going to capture you, hold you for a half hour performing furry rape /mes on you before releasing or killing you.