https://www.sciencedaily.com/releases/2023/04/230425205142.htm

If you raid the pantry at 2 a.m. for a snack, your smart lights can tell. That's because they track every time they're switched on and off.

Your Roomba knows the size and layout of your home and sends it to the cloud. Smart speakers eavesdrop on your every word, listening for voice commands.