Stealing bandwidth is one way of looking at it. Another way of looking at it is you're requesting that someone's wireless network give you internet access and it's up to its owner to decide whether or not such requests will be granted. Someone with an unlimited usage connection might be fine with his neighbors using it too. He can always secure it if outside usage starts to interfere with his own.

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Life is like a box of chocolates. All of your choices are bad for you.