There was some asshole on the threadiverse saying that copy-left licenses weren't open source, since you weren't allowed to profit off the free code. 

I say this at the risk of signal posting this regressive view to say that anybody should be allowed to view and learn from software, and benefitting from such work while closing off future access is shitty. Find some other way to make money that doesn't involve freeloading off of someone's contribution to community.