hi
i checked about 20 spreadsheets of bounty campaigns. and in these lists i found about 15 private keys to ETH addresses.
people post their key instead of their address.
all the addresses had nothing in it. maybe somebody else already emptied them.
It will only takes minute to empty all those wallets and there are people posting thier private keys in public with balances but the thing is you cannot withdraw the funds on that wallet because once you send eth on that address, after recieving the eth it automaticaly send the eth to unique address.