> First annual install. The first time an app is installed by an account in the EU in a 12-month period. After each first annual install, the app may be installed any number of times by the same account for the next 12 months with no additional charge.
This is on a per account basis - not a per device basis. The install for a phone and iPad are the same install.
[1]: https://developer.apple.com/help/app-store-connect/distribut...
There's also usually up to a 10% "breakage" between people who install from the App Store but never run your app.
If I delete Overcast from my iPhone or install it on a brand new iPad, all of my data is kept in sync. That data is stored in a database where the user id is that opaque blob.
Marco Arment (the author) does all he can to discourage users from storing a user name/password/email address as part of the login and only requires you to have one to associate your user to your account to access your podcasts on the web.
[1]: https://developer.apple.com/help/app-store-connect/distribut...
