The ability to inject your preferred biases into the system that people use for finding or generating nearly all information they consume on a day-to-day basis is extremely powerful. Eg, if all "term papers" produced by this plagiarism machine are now 20% more favourable to the machine's owner than they would otherwise be, that can have significant, compounding long-term effects.

Of course, similar things could be said about controlling information flow through: social networks, newspapers, printed books, or whatever the town crier shouts in town square. But, each advancement in information dissemination tends to be power concentrating relative to the older tech, and I don't see any reason why this most recent advance won't follow that trend.