@Sarah4643 I had a copycat as well. Because I had multiple listings to monitor, I was on the platform daily. So I wrote several different descriptions (changed the order of amenities, wording, what to emphasize) for the listing she was copying and would cut, copy and paste the different description weekly. Yes, it was a PITA on my part, but I was finally able to deter the copycat and still maintain excellent bookings.
Many new hosts have no clue how to write a decent description and will copy word for word another property that sounds like theirs. It is unfortunate, especially when you are trying to stand out from the crowd. A guest would have no idea who is copying whom. If you do choose to reach out to this person, be careful. You may not be regarded as the helpful host that you are trying to be.