I find it interesting that a game like City Patrol: Police is the first with it. It's a cheap, early access game with virtually no sales; ergo, Valeroa must be cheap too, like really cheap ($10s, 100s, or 1000s, not $100,000s like Denuvo).
Fun fact: Steam games are usually only "protected" by doing a simple "does Steam work? if true continue else Exit()." Sounds like all Valeroa does is dig deeper into Steam to verify you're licensed to play the game.
I don't understand how they think it's going to be difficult to crack nor the logic behind making it easier to crack over time. DRM always comes down to a decryption key or a Boolean value. Once they figure out how to obtain the decryption key or which Boolean to flip, the game runs.
The most difficult games to crack literally hid DRM checks in map levels. If they don't find and modify them all, the game will crash when it hits one. That makes cracking the game very resource intensive.