AFAIK, all of the participants of LIVECOIN CAMPAIGN was added to the list of yahoo62278, maybe he already removed them from his blacklist having some fairly conditions. Also from what I know, that was just a temporary, but it will stay permanent if their habit didn't or won't change.

Besides some of those users weren't just spammers perhaps they just want to have some money on their pocket, well yah know, a call of nature in times of their need. So maybe yahoo might put some considerations on some users who are still participating on LiveCoin.