you ask good questions

the answers will be vibes

sure. a goverment member would join the mesh network, while being in close proximity, and monitor conversations, but they can't be tracked since it's all anonymous. they could also disperse signal jammers, if they really needed to do so, but you can't stop all communcation, only the communication in the proximity. you'd have to deploy the jammers everywhere to where they're as frequent as street lights.