https://f-droid.org/packages/com.greenaddress.greenbits_android_wallet/
This is why I prefer apps that made it into F-Droid. If I was installing directly off their GitHub release page, I'd never know about things like this.
Discussion
green is a very sketchy wallet - you are offered options to use your own node, but I have thus far failed to log into a wallet without giving permission for the app to contact certain blockstream servers.
One of them was "jadepin" blockstream com which it seems is a required connection if you want to go past the pin step