Wasn't Hey by Basecamp rejected from the App Store for the very same reason? Since the app has basically no function if you don't have an invite, and you cannot register for it inside the app?
Would love to hear someone explain to me how is that possible.
Or maybe they paid apple for the privilege of having the app.
Or maybe apple is a silent investor. ;)
Anything is possible
I could be mistaken on exact functionality but I did this and was in within a couple of hours no problem.
So technically it isn't useless and has real functionality, just not super useful till you get the invite.
Hey charges $99 a year but didn't include an in-app sign up and payment through Apple.