Most websites are commercial, and they operate in competitive spaces. They will not consider using GPL code if it means their own site code becomes GPL-licensed

Most websites are commercial, and they operate in competitive spaces. They will not consider using GPL code if it means their own site code becomes GPL-licensed. GPL works when the people using it must contribute whatever small patches or modifications they have made, not when they have to turn over multi-million-dollar codebases worth much more (commercially) than the GPL tool in question.