Teaming with criminals is not allowing other cops to arrest/kill them or discriminating between other criminals by not attacking a specific group, and this is totally punishable.
Whereas sharing cop radio's so called
Confidential chat, is not punishable because you can share the same info using /pm or /s or via discord voice chat. Also, it's not so important, since most cops are unable to comprehend or are busy at something else.
Also medics and firefighters can see the cop radio and if a civilian is near a cop giving commands, they can see it too. I don't know why are you so bothered about this...
There's absolutely no need of this.