Like the people that exploited the pause menu to get high scores. "oh, I missed that note? (pause)(rewind) no I didn't!"
I appreciate their efforts to stop this kind of chicanery, but it is unfortunate that perfectly innocent gamers can be (have been!) robbed of their coins through no fault of their own. Fortunately, all you've wasted is your time, imagine the outrage if you had an option to pay real money to amass Blitz coins?