Thanks for that answer. That is exactly what it is. They are official accounts from the project team. If not, then be aware it is strange for a team to hire someone not well-rated. It could mean no bounty manager accepted their request.
i would love to add that some members (including but not limited to a newbie) also looks like they are running a "campaign", but in fact, they are only trying to increase their referral for another bounty campaign they join in.
so as what the others say, look carefully not only on the rank of the thread starter, but the content of the thread itself.