This is the message I got after a few seconds opening the app on a Graphene phone. Downloaded from Aurora store. Is there a way around this or maybe I should download the APK file instead? 
🔥 bitchat-android 0.8.1 with improved mesh stability and ui touches.
iOS compatibility should be improved. please report bugs so we can squash them before it hits the play store 🫡
https://github.com/permissionlesstech/bitchat-android/releases/tag/0.8.1
Discussion
Apk file straight from github