I'm quietly convinced I made a bestselling mystery novelist change the way he writes because I criticised him on Reddit.
The novelist in question is Chris Carter; the books are the Robert Hunter series. (Yes, the guy who has built a career on looking for serial killers is named Hunter. He works for the LAPD's Ultra-Violent Crime Unit. It's not a series that's overburdened by subtlety, is what I'm saying.) They are as schlocky a bunch of thrillers as you could ever hope to find, but for some reason I can't get enough of them, despite the fact that they're... very much not great. They lean pretty damn heavy on ridiculous tropes, and I've never seen a more Mary Sue lead than I have in this series, but the biggest complaint I have with them is that the same line appears almost literally word for word in the first nine books ('Hunter’s biggest passion was single malt Scotch whiskey, but unlike most, he knew how to appreciate its flavor and quality instead of simply getting drunk on it.'). I made a comment about it on Reddit on an r/books thread about your favourite terrible authors.
That post was made in January of 2019; in April, his book Hunting Evil came out, and the line was nowhere to be seen. I didn't think much of it until his new book, Written in Blood, came out a few days ago, and also didn't have the line in it. This comment is also one of the top answers if you google his name and the book series via Reddit -- exactly what you'd do if you were looking to see if people on the internet were talking about your books. I also can't find any evidence of anyone else pointing this out in a review or suchlike.
So yeah... in short, three months after I made that comment, he broke the habit of a decade of writing and finally decided that after nine stories that used this as a crutch for Hunter's personality, it was too much.
I know you're reading this, Chris. I know.