I don't know why some people can be so dumb participating in such bounties without doing background checks and then when they don't get paid, they come here wailing.
Yeah a its a cheap old trick and they haven't got any way to continue their ANN thread. Now they are trying to attract investors by their ongoing bounty campaign. Maybe still they will be able to find some greedy bounty participants who don't care about the existing scam accusation. I just checked that this scammers are still running their bounty campaign on forum.
Here it is: https://bitcointalksearch.org/topic/m.52047544