Reading the GPL at length, it seems as though it were written as if the only build process were C, and the only way to run software was on a single computer. The GPL is unclear when it comes to how it applies to something as complex as a content management system that could be deployed and running as a single service across multiple servers. The language it uses (linking, distribution, even 'code' itself) is ambiguous. And apparently the only clear way to ensure that you are in compliance with it is a shakedown from the Software Freedom Conservancy to grant you permission to use it in ways it was never written to handle.

The principles of copyleft are tremendously valuable, I just wish we had a modern license that reflected the reality of the modern internet, and modern software.