Privacy groups say Google does not clearly mention that it is sharing personal information to app developers. Nolan discovered that he has obtained a fair share of customer info himself after logging into his Google Play merchant account to update his payment details. Nolan said the information was so detailed he would even be able to use it to ” Google Wallet users were blindsided by the news that their information was being shared. Google Wallet was accused of violating the consent order by placing tracking cookies on the computers of Safari users despite telling those same users they would be automatically opted-out of such tracking.
Source: https://thehackernews.com/2013/02/google-play-privacy-issue-sends-app.html