If you bought the app on Google Play (even if you cancelled the order) I have your email address, your suburb, and in many instances your full name. Each Google Play order is treated as a Google wallet transaction and as such software developers get all of the information (sans exact address) for an order of an app that they would get from the order of something physical. Even underneath the order information there is a flag that says ‘Email Marketing’ with a value next to it, because of course scrupulous developers would always obey that flag.
Let me make this crystal clear, every App purchase you make on Google Play gives the developer your name, suburb and email address with no indication that this information is actually being transferred.
Keep in mind, this isn’t some fly-by-night Russian operation for jailbroken Android phones — this is how Google’s own Google Play store treats its customers.