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 Even when it was outdated (which I think that's the cause it got booted from the PlayStore?).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!
There are lots of reasons to pirate stuff, but this argument in particular boils down to "We should steal stuff now because maybe some day in the future I won't be able to use the paid version after they go out of business." And that is shitty.
You bought it, so go crack it now that the license check is broken and nobody will care. That's GOOD piracy. Support the creators, pirate when you can't or it's unreasonable to pay (more).
Don't just pirate to mitigate theoretical future inconvenience. Do it to circumvent actual inconvenience, or to get things you couldn't otherwise afford, or to say "fuck you" to big, shitty companies.
But pirating from a small-time dev just in case there are maybe license problems far in the future is not The Way