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 Even when it was outdated (which I think that's the cause it got booted from the PlayStore?).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!
Yeah, I agree with you completely, indeed I just posted this as in a meme manner.
I love FKM and I paid for it even when it was clear the app wasn't going to be updated that much, I usually don't feel any kind of remorse while pirating, but now this is justified and that is good too.
Regardless this is a good reminder that this can happen anytime with any app or service, being a good or a bad one, having nice or asshole devs/teams behind, and for that piracy will always be a handy solution, I just wish that abandoned apps could somehow being open sourced automatically, but that is a dream.