Yes but the way the creators went about presenting and releasing this system taunted and/or urged "thieves" to do this. If it was released to begin with in a working form with basic functions, either lock it up or release an open source or source code then let people have at it, people would be more willing to reserve credit.
The more you restrict, the more you will attract people to break into the code or rewrite it or edit and call it their own, that's just the way the world is, there are always people find ways to get what they want.
It isn't a good idea to say or present this awesome system that my clan has and say oh but I'll be releasing "public version" which will be restricted and dumbed down. Then go to communities and go here are your basic functions that aren't as cool as my clans. That's basically what happened, it wasn't done in a direct bragging manner but it was still done in indirect ways.
I agree that people should ALWAYS credit authors/devs/creators, their work, their time, they deserve it. However, next time it would be great to say hey I'm having an open beta for a version of this system I made, any communities willing to try it out here ya go. Make it extremely customization for the functions it has so people don't have to "make it their own".
---Do I think that it was in the right of the author to shut down this system? Yes I do, it wasn't all one parties' fault though, however everything could have gone a lot better so everyone could be encouraged to push this idea in a positive direction.