Open source does not require reciprocity
Matt says "one of the cardinal rules of open source is reciprocity: you can use my open-source code under the same terms that it was given to me." But this is simply not true. There are many - and popular open source licenses which do not expect reciprocity: BSD, MIT, Apache... Their copyrightholders basically say "do whatever you want with this software" and that includes changing and extending it and NOT making these changes accessible to others.
Biting the hand that feeds IT
