See the thread comments, especially
“Just got to sci-hub dot tw and paste in the doi. They have everything (but Twitter doesn’t let you use the URL)”
Seems to be a Russian pirate site that takes donations in bitcoin. The Twitter account is @Sci_Hub. Not gonna link, but it’s easy enough to google.
But common wisdom says if they don’t offer a product, then YOU are the product. What could be their angle? What data could they be harvesting?
Also mentioned is https://osf.io “Open Science Framework: A scholarly commons to connect the entire research cycle” which seems to be some kind of student/faculty research hub.