From the TuneECU.boards.net site:
Update march-27-2021
TuneECU is back in Google Play Store.
Warning:
When starting the app for the first time after an update or a new installation, you will be asked to select an account.
Of course, this has to be the account with which the app was purchased.
Example: Purchases were made with the account mustermann@gmail.com, the account must then also be selected when the app is started for the first time.
Update march-27-2021
TuneECU is back in Google Play Store.
Warning:
When starting the app for the first time after an update or a new installation, you will be asked to select an account.
Of course, this has to be the account with which the app was purchased.
Example: Purchases were made with the account mustermann@gmail.com, the account must then also be selected when the app is started for the first time.