Thetta stops cheaters from interfering with your game and negatively affecting its entire ecosystem. Cheaters get advantages and level up more quickly than other players. They cheapen other players achievements by getting valuable items faster than anyone else. They can ruin your games economy by using dupes and bots to get currency.
As a result, players quickly lose interest in the game and start leaving. They no longer feel motivated to pay for in-game perks, and their negative reviews discourage new players from trying the game.