You are not a developer so you don't understand you can compile to a binary without revealing your sources?
No copyright -> No GPL -> anyone can release their own close source version of open source software.
Why do you think GPL was create in the first place? We always had public domain you know.
My compilers work just fine? Perhaps I'm not sure what your point is.
My point is that you are unable to understand the difference between GPL and public domain.
Okay.