Plagiarism check process in Codechef

I wanted to know how plagiarism check works , like after doing plagiarism check Codechef reduces rank of cheters , But
WHAT ABOUT THOSE GENUINE PEOPLE WHO HAVE LOST THEIR RANK DUE TO CHEATING , WHY THERE RANKING ARE NOT IMPROVED ACCORDINGLY .

It is done once every 1-2 months.
Stop shouting.

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Thanks for answering , sorry for my words.