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I don't know about stifling innovation, that also sounds like another excuse. If I did something new and 1000 people copied me, I would be finding day and night to make my stuff even better. How does it stifle innovation?
Yep, it doesn't. That's what companies that created something new and original are doing all the time: they are trying to improve their creation and trying to invent something, since they are, obviously, capable of that.
You can spend your lifetime on copywriting, licensing and suing those who "have stolen your work", or you can just ignore them and spend your time on creating something new and useful. I mean, you can do both, but in my opinion those judicial proceedings will suck you dry.