No it hasn't. That's not enforcement. The community choose not to enforce. "gently" has nothing to do with it. I get that this is a preference, and they make

No it hasn't. That's not enforcement. The community choose not to enforce. "gently" has nothing to do with it. I get that this is a preference, and they make the software and choose the licence so this is their choice. But that's not enforcement. It basically means you can do whatever you want with it. And hence people do. The system works because a few are giving away a lot while most benefit from it with taking without giving back anything. This is why everything is behind an API paywall now. This is why XMPP is getting shut down. This is why IMAP is being replaced by proprietary front ends. Why we have DRM in HTML5. Why TiVo did what it did. Because, well, we let them.