Does it matter that Pokémon knows where you go – and much more about you?

Two young Cambodian men play Pokemon Go outside Tuol Sleng genocide museum in Phnom Penh on August 10, 2016. Survivors of the Khmer Rouge hit out at Pokemon Go players on August 10 after they flocked to one of the regime's notorious prisons -- now a museum to Cambodia's brutal genocide -- to catch digital monsters. / AFP PHOTO / TANG CHHIN SOTHY

WASHINGTON: Rob Knauff has lost 43 pounds (19.5kg) playing Pokémon Go. The Inver Grove Heights man walks constantly in search of characters to capture in the popular real-time smartphone app. So do his sons, ages 15 and 18. 

Knauff, 39, loves the game. He knows that the creator of Pokémon Go is gathering his and his children's movements as a condition of playing. He did not realise that it is also gathering a vast amount of other information from their mobile devices. Still, he is not worried.