Yes, it s a scam. They collect your search pattern data for their research, and they bombard you with ads for Microsoft products. Then, when it comes time to redeem your rewards, they cancel your account. In their fine print, it says that they do not have to give any reason to close your account. Several of my friends and I all had our accounts closed, and never got a satisfactory response as to why. I think that they do not want to tell you why, because they do not want to reveal how much they know about you.