Kamika242 I'm fairly sure that Revolut focuses more on developing their apps more for iOS than Android.
I don't really have any evidence to back it up but considering the app uses a glass design, even on android, and how incredibly smooth the app is on iOS versus the clunkier Android version suggests they put most of their efforts on iOS, so I'm not even surprised it crashes on stock Android.
A shame really. Oh well, back to my traditional bank for the time being. Glad I never put any money in Revolut savings, in case something like this happens.