Given that they don't seem to have any automatic tests or similar for their APIs (check out their Google group and you'll see that stuff have been broken for a long time for all users without attention. When stuff has been broken in the past, Instagram people will ask "is this still a problem?", like they have no way of checking their own APIs...), I wouldn't expect them to be that crafty.
//edit: oh, now I see somebody thought of my idea too https://github.com/dmpayton/django-admin-honeypot