Hi, I was looking on the Microsoft store and saw that this "company" seems to be taking a lot of free software and publishing it on the Microsoft store and selling it, ReText included.
They rebranded it to "Book Pad Pro", but still use a screenshot from ReText (and you can even see it says ReText in the screenshot)
This is the store page: https://www.microsoft.com/store/productId/9P4R79GC8T68
I'm not sure if you can do much, but I thought I would bring this to your attention anyways.