It sounds interesting at the same time as a bit weird. If this gets implemented it should be limited in some way, as an example. You should be able to do it only when a certain amount of the group/squad/company members are online. As an example. A GBR is only possible if there are more then 3 S/C members on. Also there should be an "important" cooldown to it, just for the case if a gang gets bored during the morning and starts raiding the same squad/company/group over and over just because they are easy.
Adding rules to it and restricting it in controlled ways. I imagine, as soon as a GBR would start you would see 10 crims on drugs camping right at the spawn of the squad/group/company.
Vaults should have different designs, and even have a chance to be added as a reward for level, if you get level 5 you can customize your vault. (It would not only make it harder for the criminals, but also add variety to it.)
Limit of the people that are raiding. I imagine a mix of all sort of criminals (15 +) from different orgs raiding 3 players.
If this ever gets implemented, it will have to be REALLY thinked through in order to avoid all kind of different possible abuses.
It's a good idea though, but will have to be properly thought through.