Surveillance doesn't always run 24/7 for every device. The signal/noise ratio would be extremely low.
To keep a high ratio, it's selectively switched on for high interest targets.
There's no reason for a drone flying on my backyard to send any data to China. Their privacy protection is inexistent. You can ask it to be conceivably whatever horse shit you like, I don't care. I don't want any bytes sent there.