It also provides convenient access for law enforcement to monitor all of my social media accounts and communications and metadata and scan my storage for contraband. Preferably with a warrant but of course probably with any number of backdoors installed by design. We all know at this point that warrants don't matter either.
Radio broadcast can certainly be used for surveillance, in that at the very least the location of the broadcast signal can be triangulated and monitored. Which is how law enforcement can also use the "smartphone" in my pocket to track my location in realtime.
Even when it's turned off. Because the definition of the "off" button doesn't matter, either. It isn't an "off button" it's a button that runs an app that simulates "turning the phone off," but might just put it into a low power state or who knows?
Your computer spies on you. The web spies on you. Your appliances spy on you. Your car spies on you. Your lightbulbs spy on you. The locks on your front door spy on you. Unless you're primitive enough not to use modern "smart" technology (which isn't defined as surveillance technology but which always seems to be in the news because it gets used or abused as exactly that.) Everything, everywhere, spies on you all the time. And if it doesn't, wait a few years, someone will find a way to make sure that it does. But none of it will be surveillance "by definition." Convenience, customer obsession, safety, the definitions will be plentiful but none of them will matter.