"I don't like GPL licenses myself, I prefer BSD/MIT/etc."
The GPL may deserve some criticism from a business point of view, but how many of the businesses that criticize it openly, or attempt to dodge it covertly, were brought to success thanks to developers who could become what they are by studying and modifying code that without the GPL would have never been published?
It's actually a common misconception: that companies publish code because GPL forces them to. In practice, it works the other way around: first you make the decision whether to publish the code or not, only then you choose software with appropriate license.
The GPL may deserve some criticism from a business point of view, but how many of the businesses that criticize it openly, or attempt to dodge it covertly, were brought to success thanks to developers who could become what they are by studying and modifying code that without the GPL would have never been published?