I'm biased on this issue based on the fact that even if Yahoo wore a scam exchange's signature (based on factual open scam accusations against that exchange), I guess he did wrong but it may also have been asked by the company to be giving him a better financial deal he's ought to take, so he took. Another view of me looking into this is that fact we all can't deny, and i.e.; Yahoo didn't leave a single spammer aside and banged banned almost each and every of them and played his part in keeping the forum as clean as possible. Now, what could he do if the list has around 300-500 (and even more) people who joined the campaign? Is it an easy task to watch all of them? Still he banned a lot of accounts, so it'll be quite more of a dishonor to tag him. Biased as I said before.