percentage of people that cheat estimate?


Using 3 months worth of these:
https://www.chess.com/article/view/chess-com-month-in-review-may-2021
A rough estimate is between 0.2% and 0.3%
In other words somewhere between 1 out of 330 and 1 out of 500.
Your guess of 20% is 1 out of 5, and obviously wrong.