Not sure if capacity is the thing here. Using someone else's wifi does harm to that person. They will be deprived of bandwidth and, if they have a data limit, y

Not sure if capacity is the thing here. Using someone else's wifi does harm to that person. They will be deprived of bandwidth and, if they have a data limit, you may be using that up too. With light, what you're getting is just their waste, it's similar to go through your neighbor's trash. With wifi, if you could use the leaking signal to heat your dinner or something like that, then it wouldn't be stealing, that's just their waste. However, if you actively connect to their router and use their bandwidth, it's a completely different story.