Somewhat off topic, but I remember being so happy after graduate school when at long last I could actually put down a book I didn't like and never have to finish it! I didn't have that option while in graduate school. Those were print books of course as that was back in the 1980s.

I too simply delete books from my devices which I don't like or don't care to finish. I always keep a copy of them on a computer though. I find it hard to throw away any books, even bad ones.