Don't let greed override your common sense. Delete that GitHub crack bookmark and clean your PC safely.
Most "CCleaner License Key" repositories on GitHub are not official or supported by Piriform (the makers of CCleaner). Instead, they are usually: Ccleaner License Key Github
Here is a proper, objective write-up detailing the situation, risks, and safe alternatives. 1. What are CCleaner Github Keys? Don't let greed override your common sense