We already have examples of copilot blatantly plagiarizing code
I definitely understand why people pick a license that disallows use someone doesn't agree with. Imagine baking cookies for your friends, and one of them reselling them. The material effect is the same to you, you gave away your cookies, but sometimes you make/do something for a certain group of people and not for other to make a profit of your work.
But a great deal of the value that's come from open source generally has been that open source licenses haven't imposed the sort of usage-based restrictions (e.g. free for educational use only) that were fairly common in the PC world.
And, to your example, in the case of software the incremental copy that your friend sold cost you absolutely nothing. So it comes down to a purely emotional response to someone else making money off something you made.
Exactly, as I said, the material situation is the same. But we all are emotional beings, you would do certain things for your family you wouldn't for strangers. I don't think this case is any different.
I personally don't work for free for a company, but I do charity work for free. Working for a company in the time I work for a charity would "cost me absolutely nothing" if I already spend the time anyway, but everyone understands the difference.
Edit: commercializing of the derived work is one explicit consideration used by US law in making a fair use determination. That said, even if it weren’t commercialized it may still be infringement and I believe it is.