Your google account was terminated because you installed a different app store on your phone?

Aurora offers to use some built-in account, which sometimes doesn't work, or to use your own. I guess OP used their own and got banned. Similar can happen to NewPipe etc users, Google doesn't like third party clients - allegedly.

Hacker news discussion of the NewPipe account ban incident: https://news.ycombinator.com/item?id=21247759

If I remember correctly, Aurora recommends signing into the app with a burner Google account in case of issues like this. I think Google's problem is not so much installing a different app store, but signing into your Google account from it.

I'm pretty sure you can use aurora store without connecting it to your Google account, though you can only install gratis apps this way.