How does this happen? I never registered for this bounty campaign and now my account is listed on the spreadsheet. There may be others. You may want to see if your account appears as registered for this campaign. This really pisses me off. I don't think my account was hacked though.
No need to hack your account. Anyone can use your name or any other random name to join the campaign as there is no restrictions and the bounty manager didn't even ask for an authentication post.