Totally depends on the device(s)...”Smart Meters” (electricity) just report your usage (via cellular)...mess with that and the power co. disconnects you. You voluntarily sign up for the “turn off your A/C thermostat” interface device for lower “time of day” rates...don’t sign up for that. Most vehicle spying can be eliminated by not paying for the “telematics”/cellular features or by not signing up for reduced insurance rates with the OBD-II “spy device”. “Drive Safe & Save”, etc.. Auto insurance companies have been known to read your onboard OBD “black box” after an accident claim tho..
So far
Until the smart meter becomes mandatory, there’s no way I’m going to sign up for letting CPS energy control my thermostat.
Sometime back I remember reading or hearing about a device for your home power production that was essentially a small sealed nuclear reactor requiring minimal service about every 20 yrs. or so. This sounded pretty good as this should put you essentially “off the grid”. Of course, your home would necessarily be all electric.