Apple has a program called MFi, usually you're supposed to get a MFi license if you make hardware for the ipod/iphone family. Since idapt doesn't list MFi anywhere, I'm guessing that they don't license it, and they aren't popular enough for Apple to sue yet. You don't have to ask Apple if you're just going to violate the license anyway... as long as you're small, Apple probably won't care. I think these guys tried to do the "right" thing.
I'm sure there are a few dozen chinese companies that violate all kinds of licenses that nobody really cares about. There's this chinese company that makes an iPhone knockoff that is actually called "iPhone" -- saw on the streets of Hong Kong. How do you think they do it?
[1] http://www.idaptweb.com/interchangeable_tips/charger/tp/ligh...