Yes, this restriction is placed upon other factions, too, but one must keep in mind that these are official factions and that they don’t split up into smaller ones in ways that matter. A universal rule of “You can’t have two characters in the same faction” wouldn’t work here, because GangRP is not one large faction, it is a bunch of smaller groups weaving a community together. Each one is different, each one has different lore, ideals, goals, events. In this way, we can think of them as smaller factions that take leap from the same baseline instead of seeing GangRP as one faction. KPD ≠ GangRP, KPD = Bonten = Rakkiyatsu and so on and so forth. And even then, we run into the problem of what a gang really is - just because a group partakes in CrimeRP doesn’t make them a gang, in my opinion.
If this rule isn’t re-implemented, the staff should at least reconsider their definition of “a gang”, as has already been suggested by different members in the thread.