The WoT Tank Quiz doesn't collect any kind of data about the user. It isn't even able to do so because it doesn't have any permissions like internet access :)
If you use the Google Play Store, I get some informaions about the installations of the app, like every Developer on the Google Play Store. E.g. I can see how many user come from which country or which devices or Android System Versions are used.
But this data is anonymous, I can't identify the user from the data.
Since this project is free software (open source) you can grap the source code and check if I'm telling you the truth ;)
If you enter personal Information like your email address on this website, I will not give away this data to anyone and I will only use it for the inteded purpose (I won't send you ads or spam).
If you want me to delete this data, just write me a short message.