Is bookcrossing still a thing? (yes apparently)

Since doing an awful lot of thinking about the value of books my brain has gone down some weird rabbit holes. 20 odd years ago, in a different life when I was a different person, I very briefly worked for a company involved in book data. At the time, as now, I had a deep love of books, but the company and life moved in other directions and I was only there for about 9 months. In the same period I…