If people are remorseful enough then there'd be enough feedback in reviews that others know to beware. And that would lead to author names associated with those works being outed and likely boycotted or something. This particular author has ~11 pen names, so assuming a roughly equal spread across her 370+ books, there should be a crop of bad reviews for books associated with a name that has maybe 25 - 40 other books associated with it. There should be a pattern for people to find and then say "Someone has been putting out slop under these names; avoid like the plague", which should then trigger a considerable gap in sales for that author.