Newbie's release of the bounty is indeed a bit less credible, but i believe that only a small percentage of them are scam. Because if it is scam, it would not be silly to use newbie as a bounty manager.
Some Newbie members were the from that project or part of that ICO, it's a good thing since they can fully hands-on marketing, if not then better avoid it since they have nothing to lose at all. No post or merits at stake and they can easily be left any moment.