People that sell fakes are stealing, same as a thief that makes off with your wallet.
The people that build Oyaide get a bum rap when the end user is not impressed with performance and the buyer does not understand. It's pretty much bad for everyone except the factory that makes the knockoff and the crook that misrepresents it.
Not to soap box, but when I was growing up cheating was one of the lowest things a person could do. In school we were graded on content, spelling and originality. Originality does not seem to garner much respect these days, copies and counterfeits abound in everything from car design to fake Euro watches.