To leech or not to leech: is it bad or is it good?

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If, let's say, you own a laptop and you've been receiving wireless connection alerts lately (meaning there's an available, open wi-fi internet connection in range), will you connect to the said connection and leech? (avail of a free connection without the paying subscriber's knowledge) Do you think it's good or bad? Is it ethical or not? What will you do if you're in such situation?