I can explain to you since you are not familiar with this topic. After a newbie gets negative feedback for it, he goes and registers another account. I assure you it works 95 percent. What happens next? Now two accounts are being deceived in the bounty, and so on according to the scheme. Anyone who has tried to work with one account starts participating with two or three accounts.
Some bounties accept accounts with red feedback.
The most surprising thing is that for those who have a review that he is a bot, it is almost difficult to find other violations.
Therefore, by leaving a neutral review, we do not provoke a person to create even more such accounts. If he sees a neutral response, then he is unlikely to repeat the same mistake another time.