Because what he found was wrong, that's why he/someone reported his post to moderator to be deleted.
Here is what their bounty manager said
Hello. Thank you for your feedback.
In the morning, we have removed those 21 accounts from the bounties and gave those guys negative trust regarding the thread you sent us.
However, after some complaints, our team made some extra investigation, and we have noticed that the submission of that specific wallet address is not proof of cheating.
Because everyone's BNB address from Binance is the same, those guys did not enter their memo from Binance. It means if all of them were alt accounts of the same cheater, he/she would enter a different BNB address than Binance address or Binance's BNB wallet with the same BNB memo. Without a BNB memo, those BNBs would go to Binance directly, which has no profit to a cheater.
For now, we have to remove those people's negative trust, and we have to add them to the bounty spreadsheet again. We apologize to that 21 participants removing them from bounties without a certain proof. We will increase those 21 people's reward %10 more than they will earn if they will be eligible for the bounty, and they will not have any extra cheating proofs.
Our team is doing its best and works hard to determine the cheaters of bounties. However, we would still be thankful to anyone who can find more cheaters and disclose them for a fairer bounty distribution.
Best regards.