On letting go of the GPL, by Martin Kleppman:

For all these reasons, I think it no longer makes sense to cling on to the GPL and copyleft. Let them go. Instead, I would encourage you to adopt a permissive license for your projects (e.g. MIT, BSD, Apache 2.0), and then focus your energies on the things that will really make a difference to software freedom: counteracting the monopolising effects of cloud software, developing sustainable business models that allow open source software to thrive, and pushing for regulation that prioritises the interests of software users over the interests of vendors.