Valetudo exists for local only operation of robot vacuums. Not for the point and click among our modern society, but if someone was paranoid enough they’d probably make it happen.

Sorry if that sounds like a jab, not intended 😅

Many “smart” devices can be modified, blocked or just not connected in the first place. I prefer to waste hours of my life figuring out extravagant ways to break these devices, only sometimes enabling local only functions.