Out of the goodness of their hearts. To save other people the trouble of having to spend years developing such tools themselves. Just because one is giving and unselfish doesn't mean one has to be pathologically subservient.

Imagine this: someone has run out of gas. Do you A) help them by giving them a bit of gas that you already happened to have in your vehicle or B) Give them the title to your car and walk home. Is the person who chooses option A selfish? I don't think so. I think they're kind and giving. The person who chooses option B is insane.