Google Play Market lacks of Privacy

[monkey_man]

Interestingly enough, it is not just apps you've downloaded from Google Play/Market. I've downloaded most of my apps from the Amazon app store and they also show up in Google Play as installed.

Yeah, Google Play will show all apps/games without caring the source of where you got the apps as long as they are available to get from the GP market. The only difference is that GP Market will give you a pop up warning for all apps not purchased via market itself. You will see update sign for the apps that you've installed, and the only way to remove the update notification is by waiting for third party app store to give you the update.