lol, yes, funny + messed up. how about shutterstock gives the full details of the thief's account? ah, but then thieves would probably start filing fake dmca reports to steal  that info too...

simple solution:
a) don't allow accounts from east india/nigeria/etc - because most of the 'stolen' content originates from there. it's an accurate stereotype, because those tend to be the 'business models'.
b) if it has an east indian name, don't allow the account to be opened, again --^ see above. OR - require extra proof that the assets are indeed there's - OR - do a little extra checking before allowing such an account to be opened up.