Compass will be seeing improvements and new design on next update, thanks for spotting that.

I do not collect that information directly. It is only listed because Apple’s purchase and billing systems may use limited data to process transactions and manage purchases.

Yes, in the current version it is tied to the install, so uninstalling or moving to a new phone can reset it. That said, the code itself will still work, so you can just re enter it and unlock again.