I'm a good little boy who would never try to break into anything I didn't own no matter how insecure.
That said, many of the new AI cameras, gas station skimmers, wifi pineapples, pwnagotchi, flippers, and other interesting things or potential threats can be detected using Marauder or GhostESP software. Also keep in mind that a massive amount of metadata is leaked without any offensive action needed to collect it.
In most jurisdictions listening and attempting to decode or interpret is legal on all bands.