Oh, there's certainly a kill switch. Jobs admitted to it during an interview, but it hasn't been used. The closest App Store comparison is probably Abuse (source code released into public domain, http://en.wikipedia.org/wiki/Abuse_(video_game) ):
Long story short, Eurocenter did not have the right to use the sound effects, registered levels (levels 5 and up), or the Abuse trademark in their game "Alien Abuse".
So very similar circumstances. And the original app was never killswitched.
http://appshopper.com/games/alien-abuse (pulled from app store)
http://appshopper.com/games/abuse-classic (official version)
reason: http://forums.toucharcade.com/showpost.php?p=426791&post...
Long story short, Eurocenter did not have the right to use the sound effects, registered levels (levels 5 and up), or the Abuse trademark in their game "Alien Abuse".
So very similar circumstances. And the original app was never killswitched.