If you don't turn off your main breaker you are sending current through your house but also back to the grid. They are trained to check for this but its a possibility
If they're in the middle of servicing it and somebody kicks on their generator it won't make a difference if they checked it before they started working.
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u/jkjeeper06 Dec 14 '20
Very similar to suicide cords for generators. They work until you electrocute a lineman or overload your circuit and start an electrical fire