I think it's flawed for a different reason: you have no idea if the 'off' switch is actually turning off what you think it is in these proprietary systems (e.g.

I think it's flawed for a different reason: you have no idea if the 'off' switch is actually turning off what you think it is in these proprietary systems (e.g. Apple's 'wifi off' fiasco). If you do not want Apple/Google/Amazon/whatever listening to you, do not use their services/products.