That is my biggest issue with them, nefarious governments aside, if it can be remotely turned off sooner or later somebody will switch it off remotely, it'll either be bored teenagers hacking the system for laughs or someone who doesn't like the UK and decides to cause chaos. Where I live we usually have several power cuts a year and it's made me acutely aware just how reliant on electric we are.My biggest worry is people hacking the system or maybe a rogue employee, or the contactor itself could fail.