rabbit r1 is not an Android app. We are aware there are some unofficial rabbit OS app/website emulators out there...to clear any misunderstanding and set the record straight, rabbit OS and LAM run on the cloud with very bespoke AOSP and lower level firmware modifications, therefore a local bootleg APK without the proper OS and Cloud endpoints won’t be able to access our service.
I dunno what a "bespoke firmware modification" is but 99+% of apps run "in the cloud" (dependent on remote servers)