Good point. But, for pedantry's sake, your analogy is backwards. The person you're replying to is questioning the accuracy of Fakespot, which would make them

Good point. But, for pedantry's sake, your analogy is backwards. The person you're replying to is questioning the accuracy of Fakespot, which would make them a competitor. A shill would be endorsing the service, or placing doubt on the critical comment, as you have done.