I've heard that "corporate parasite" argument way too often, but it's massively overrated. Open Source allows selling anyway, MIT, BSD and GPL all do. If someone makes smart changes and lives off it, that's awesome, not reprehensible!
GPL only forces source disclosure when distributing binaries, not for every damn thing – imagine you land a juicy company contract: you tweak a GPL work, deliver the binaries, and only have to hand the modified source TO THAT COMPANY, NOT the whole world! That's why AGPL fanatics had to invent their SaaS trap. For me as a hobby coder, GPLs are just pointless headaches instead of real freedom.