Because it's easier to clone someone else's "good taste" by just mimic'ing their formula / ripping of their exact implementation of a feature/ui. The gap between "first to get it right" and "everyone else catches up" could become non-existent in software. You'd need to continuously innovate (I think to some degree, this has always been the case, but it's the tempo that has changing).

> Why is it easy to copy? I think music trends would be one historical example of this? With software it's a bit more concrete (I'll just make my app function EXACTLY like yours does) and there is less protection from the law, unless you manage to weasel your way into a patent.