Thanks guys, glad you liked the post. And Romain, I can't disagree with your reply either, but like I said on Twitter I just think in practice it's too hard to reliably distinguish between style and brand or judge intent.
@Jeff I don't quite agree with your stance. I posted a response to Sacha's post about this precisely : http://blog.hull.io/post/45265570189/style-and-identity
Really great post Sacha, exactly what I've been thinking about this issue. The best you can do if someone copies you and you don't like it is rationally and politely ask them to take it down. If they do, awesome. If they don't move on and don't worry about it - copies are hardly ever as good as the original anyway.