> Are there any institutions that require using an app? Yes, there are. In order to log into Revolut web UI you need to confirm your login through their app.

> Are there any institutions that require using an app? Yes, there are. In order to log into Revolut web UI you need to confirm your login through their app. There are many other examples but so far I didn't find any single banking app which doesn't work on MicroG. From what I've heard russian Sberbank doesn't work without safetynet though.