Even the folks behind generative AI writing are embarrassed at how bad it is, but Grammarly ripping off the voices of well-known modern writers is indicative of a much larger problem.

Grammarly turned people — both living and dead — into ghost editors

Grammarly turned people — both living and dead — into ghost editors
Apparently, Grammarly had a feature that encouraged users to rip off other well-known writers’ styles. TechCrunch has a great piece on it, in which you find out that Grammarly would offer “expert review” — sans experts.
It seems that, as you wrote, the tool would pop in and suggest revisions from the perspective of experts. Of course, the experts in question, like Platformer’s Casey Newton didn’t know this was happening.