This is the app called Franco Kernel Manager, one of the best kernel managers that are out there... Even when it was outdated (which I think that's the cause it got booted from the PlayStore?).
I used it to check the process of my phone and monitor the active and idle drain mostly, I paid for it a long time ago, but now it just fails to check the licence and it doesn't let me use it fully... I think there must be a cracked APK over there...
EDIT:
Fortunately the app is back in the store and hopefully that update version comes soon enough!
Playing devil's advocate here, but is it truly a public good to have as many works as possible accessible to the public?
What if misinformation outweighs real information in the aggregate?
I'd say generally yes but maybe not in every instance. Consider it an overall principle rather than a hard no exceptions rule.
That said, copyright/creator control is not the correct tool to use to do so.