Why? The code is GPLd for those who are allowed to use it. It is not free as in beer. But once you get the beer, you will get to know the recipe.

But if you think there is some other license that better expresses my... sentiment... you are welcome :)

(I know, it sounds kiddish. It was a long time ago and I felt really burned because PayPal management, from lower to top, is seriously fscked ethically. It took me more than a year to get interested in creating something new.)