Battlestation: Harbinger Piracy Rate

hello,
im currently learning c++ to make my own games and i have an idea to prevent pirating:
when you buy a game on google play (and i think on apple app store too) you get an email receipt of your purchase.
when someone pirate it he gets non, does he?! 
taking that as base when first starting the game you need to create an cloud account and accept the AGB.
the game then checks if the player has gotton this email receipt, and if not...
it just spams the game with tons of ad´s and sends spam emails(about 1000 a second to slow done his wlan connection!) to the player XD
if you do that you will still get money by this assholes! XD