You can be sure that the confusion is not accidental. As I see it, it's a way for MS to profit from free labour for it's support service and a marketing stunt

You can be sure that the confusion is not accidental. As I see it, it's a way for MS to profit from free labour for it's support service and a marketing stunt to benefit by association from the good reputation of this researcher and his initiative. Even if it is not the case, people like the one previously will think: it is Microsoft employees that are managing this website, they know security.