If you realize your game's been cracked by a cracking group, I wrote a whole guide on my website telling developers on how to deal with it. The easiest way to do it is to file a DMCA complaint. The guide on my website can be located here:
http://drillimation.com/2021/03/28/did-your-game-get-cracked-by-a-cracking-group...
I had to do this once for my game Chuhou Joutai. After I filed a DMCA complaint and the page was subsequently taken down, I posted the following press release on my website:
http://drillimation.com/2020/10/26/drillimation-systems-targets-skidrow-cracked-...