I feel somewhat different about the whole issue, and I want to underline something:
Permissive licenses are about developer freedom, but copyleft licenses are about user freedom. I care about user freedom more than developer freedom.
Another angle is, if I create a tool/library and I share it for free, it's GPLv3. User freedom is non-negotiable plus, I don't want my free work to be sold to anyone. It's created to be free as in beer and as in speech.
I don't allow otherwise.