In the most simplistic terms, yeah. That's true. But the constraints aren't really shaped like that. For instance:
A completely-innocent Airtag speaks only bluetooth, and it can be activated from continents away -- as long as any Apple phone is nearby with a shred of Internet access.
My similarly-innocent Samsung phone is programmable (using its built-in Routines function) to perform actions in response to becoming disconnected from any given Bluetooth device.
In the most simplistic terms, yeah. That's true. But the constraints aren't really shaped like that. For instance:
A completely-innocent Airtag speaks only bluetooth, and it can be activated from continents away -- as long as any Apple phone is nearby with a shred of Internet access.
My similarly-innocent Samsung phone is programmable (using its built-in Routines function) to perform actions in response to becoming disconnected from any given Bluetooth device.
> he can't detonate it from more than a few metres away...
Reliably bomb detonation is on the roadmap for Bluetooth 8.