A few years ago, I paid for the donate version of the CryptCoin Monitor App.
It still works great!  I just now got a new phone, and after installing the app from a backup, that works great too!
But the app didn't auto-install using Samsung's Smart Switch / Google Play Store reinstall process, it had to be done manually.

Hmmmm...  so why am I writing?
I'm confused ... that this app is no longer in the Google Play store, and that I've found no mention of it elsewhere (other app stores, private website, etc.).
The price of BTC has risen sharply (sadly, I sold almost all of my gains when it was at $1k).
But it seems that an app like this would still be useful today, or is nobody mining nowadays?
Perhaps Google isn't getting a cut, or, the app didn't meet their evolving guidelines (perhaps they're discouraging cryptocurrency apps as it's harder to get their cut?).