If you sound like a car ad from Road & Track, I'm going to flag you as bot.

"No rough handling. No struggles to accelerate. Just pure performance. The new Toyota GT. It's not just a car—it's a revolution."

Most of the tropes listed on this page give text a more "car ad" (or sometimes "movie trailer") quality. I wonder if magazine scans and press releases unduly weighted the training set.

I think it's more likely that car ads and chatbots are both optimizing for the same thing i.e. grabbing the audience's attention.