That's 99% of my uses.
I want a device that does only that and runs purely offline. I'm sure between Whisper.cpp and LLaMA.cpp I could make this a reality with an old spare laptop.
No phone ? no computer ? no wi-fi ? no internet ? no electricity ? no neighbours ?
Residential security cameras seem less common where I live (Australia) than in the US though. A couple of my friends have “smart” doorbells but I don’t think any have security cameras.
Don't you also have control over your own security cameras ? (you bought them and set them there, they didn't fall from the sky)
I see it in the perspective of phone and computers to be also cloud-connected, always on, with potential camera and mic activated.
For the record I have “hey siri” turned off too, though I don’t consider it particularly risky.
Doorbells are notoriously outside... although you can see who comes and goes or walks by.