Don't forget the compelling aspect of the GPL is that it empowers the end user, the recipient of binary distribution, not the developer/distributor.

The end-user is guaranteed to have access to the source code and to have rights to distribute it and derivatives of it.

The best example I have of why this is a good thing, relates to a Windows app called UI-View which was developed by a radio ham for other radio hams to use. It was released a shareware, but the majority of freeloaders using it didn't pay for it, which upset (quite rightly) the author. He was so annoyed that he specified in his will that the source code should be destroyed, so that the freetards wouldn't get any updates.

Well, he died, and so did any hope for the multitude of UI-View users (even those that paid) that even to this day don't have a better option than to use antiquated code on new Windows platforms.

I wouldn't put myself in their shoes - I don't rely on anything that I don't have the source code for.