Just to play devil's advocate: The electricity in the restaurant would be on anyway, and bathrooms would be used anyway, regardless of whether the remote worker was there. What's the actual cost to a restaurant if I decide to sit in a corner all day on a laptop? As long as I was not disturbing anyone by having loud conference or phone calls, and as long as the restaurant is not full and I'm not taking up a spot someone else is waiting for. Surely the small trickle of electricity needed to charge a MacBook Air is not a material expense.
I mean charging the laptop does increase electricity consumption. As well as flushing toilets, using soap and towels, and wear on plumbing — and maybe frequent cleaning, depending on the restroom habits compared to transit visitors