It was revealed by Niantic that there has been a new update regarding its rules of conduct for users of Pokémon GO. According to the company, as of now, players can take up to three ‘strikes’ within the game, due to the use of cheats like fake GPS, and use in the background of other softwares.
Strike 1 is a warning that rare Pokémon will no longer appear around you, strike 2 is a 7 day suspension and strike 3 is the permanent cancellation of your account.
Source: Pokémothim