This is not enshittification. Here's where the term came from:
Here is how platforms die: first, they are good to their users; then they abuse their users to make things better for their business customers; finally, they abuse those business customers to claw back all the value for themselves. Then, they die. I call this enshittification
In what way is adding an AI assistant to Notepad either "abusing their users" or "abusing their business customers?" It seems like it's just a useful new feature to me, that's still in the "be good to your users" phase.