You are better off using an open source app like Aegis, KeepassDX, among others.

Is there a non paywalled article somewhere? It asks for a sub the alternative asks for sign up and free trial.

These are miui shenanigans. You can disable chrome in settings and set different browsers as default on most other Roms like oneui, stock android, realmeui, etc. Last time I used miui, I decided never again.