Is there any proprietary Android app for which you wish there would be an open-source alternative?
Basically, what the title says. Do you use any app, that is proprietary, but either has no OSS alternatives or they're all not good enough? If there is an alternative, what keeps you from switching?
FYI, you can replace Steam Guard. There is a plugin for Keepass that can generate Steam OTP codes and it's built in in KeepassXC (IIRC) and in KeepassDX on android.