It'd doubtful the folks at the company actually mind that the interviews are being cheated. If the candidates appear to be qualified and appear to be fill the role for which they were hired and appear to be competent in that role, that's sufficient for most corporations and one of the problems working in "tech". That is to say, there are plenty of people in it that appear to be doing a thing, but aren't actually capable.
Somewhere in this thread a poster mentioned woodworking, which is a nice contrast. If you hire a carpenter, it becomes obvious pretty quickly if the carpenter is competent.