I would use this rule of thumb, if/when I run into the tutorial writer will I be able to tell them what I did with their tutorial without shame or guilt and will they still respect me? If the answer is No then I wouldn't do it (sell, share, give, buy, etc).
That is my opinion and I am sure that plenty disagree with me. I feel like I sound holier than thou, which is not my intention. It is just honestly how I feel about the issue.
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