I commented about this elsewhere in this thread, but the Contributor License Agreement for RoboVM gives RoboVM AB (the company) an unrestricted license to your

I commented about this elsewhere in this thread, but the Contributor License Agreement for RoboVM gives RoboVM AB (the company) an unrestricted license to your contributions. As a result, the contributors cannot assert that they are violating the GPL since RoboVM is not actually on the receiving end of it.