This happens more often than you think. Curebit just happened to get caught because the developer probably just copied and pasted the original HTML. And the fact that they copied from a ridiculously high profile site.
I remember when Leaky (YC S11) launched, its design was quite obviously taken from Square, but they put the notice: "All design credit goes to Square. We based our design on their home page until we can hire a designer of our own." http://techcrunch.com/2011/08/08/yc-backed-leaky-is-hipmunk-...
