> Of course we’d have code to cross-pollinate; an entire ecosystem of liberally licensed code exists.

> The GPL absolutely prevents you from making your own derivative unless you adopt the same coercive, viral license.

And what incentive I have to allow everyone to create closed derivatives of my code and use them to take freedom away from their users(most likely including me).

If they love closed code so much, they are free to hire as many developers that will write it for them. But it costs money while taking someone else code is cheap. I don't want to help people who want to enrich themselves on someone else work without giving anything back.