Maybe it's true that the Amazon App Store the Google Play goals always lags behind;
but I still do not use this, because anyone who has ever created any Google account in the smartphone, backing gates, the number of services, or Youtube, can mitlerweile be sure that all his data is constantly cross linked, even if it is not logged in. Then Google asks about his Adsense advertising from all data and submit them as soon as possible both with a in cookies and Flash cookies.
And that Google passes on all its information to the US government is even in its data "protection" policies.