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I will answer questions for free with no cost for the price of zero and we don't require you to provide a credit card upfront.
Didn't this cost me 1 sat to get you to answer this question? So, technically, not "free"?
Did it? I didn't know, please don't sue me.
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You're safe, I think.
The comment (asking the question) did incur a fee to SN for 1 sat, but your reply (answer) came at no additional cost to the asker. So I don't think a lawsuit would win.
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