I don't know how you feel about second hand robots, but they are dumb enough to respect your privacy. The old Irobot roombas, They just run off of a internal clock, no connection to the internet, they bump around a bit, then dock themselves when the battery starts to get low. I pick them up at flea markets for 20 bucks, usually need to replace the battery, brushes, but they sell all that. Be weary if they smell like poop.

Bruh, just don't give it your WiFi password.

They don't have their own cell phone plans or satellite uplinks.