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The author of JSLint wrote:
"So I added one more line to my license, was that, “the Software shall
be used for Good, not Evil.” And thought: I’ve done my job!
/…/
Also about once a year, I get a letter from a lawyer, every year a
different lawyer, at a company. I don’t want to embarrass the company by
saying their name, so I’ll just say their initials, “IBM,” saying that
they want to use something that I wrote, 'cause I put this on everything
I write now. They want to use something that I wrote and something that
they wrote and they’re pretty sure they weren’t gonna use it for evil,
but they couldn’t say for sure about their customers. So, could I give
them a special license for that?
So, of course!
So I wrote back—this happened literally two weeks ago—I said, “I give permission to IBM, its customers, partners, and minions, to use JSLint for evil.” "
Getting paid in money is one motivation for people, but not the only one. Some people do things because they want to, regardless of payment. And some of them want to give what they made as a gift to anyone. The flip side is that no one can force them to do anything, it’s all voluntary.