[Amhazair]

That's because - CBM aside in these parts - there aren't any other "must use mods". Games organised on here generally have CBM and sometimes one or two other mods (nation or other) someone wants to try out, but generally, if it's not specified it'll be just CBM. (There's also the occasional non-CBM (or earlier version of CBM) game being organised, but that should then be clearly stated in the OP, just because it's unusual here)

Disclaimer: The above goes for games organised on these forums and the dom3mods forums. The Something Aweful forums generally have different preferences.