Everyone that joins ICOs, bounties or airdrops might recently be receiving some emails purported to be from a project administrators informing you of that your earlier contact of the support has been escalated and you need to be a certain sum of bitcoin or ethereum in order to abade the problem otherwise, you lose your investment or earnings.
It is a scam. Beware!!!
That's why in the bounty spreadsheet, bounty manager need to hide the email column so our email won't be leaked.
Email is one of the most used method for phishing activities by scammers and hackers.
If you have to pay some ETH or BTC to get your reward, then it is clearly scam.