Why participate if it's not your thing?
If an author were giving away a romance novel, I wouldn't sign up to get a free copy, because I know it's not going to interest me. And if I did win a free copy somehow, I wouldn't read 50 pages and then give it a bad review because I didn't like it.
Yet some people will participate in a giveaway even if they're not really interested in that type of book, and I'm curious why. Why sign up to win a free copy of a book that they probably won't like? Added to that, some will leave a review or feedback even though they don't finish the book because it's not their thing. Does this make sense to anyone?