Who cares? If they don’t want their power drawn they need to be burying their powerlines anyway.
They really don’t care. It’s a rounding error.
Perhaps if enough drones did this, they would indeed bury the lines. But that would be strictly worse than a world in which they didn’t bury them, and drones don’t steal electricity regardless.
Who cares? If they don’t want their oil siphoned they need to be burying their pipelines anyway.
Most would agree that unauthorized draws from common infrastructure resulting in loss is theft.