I don't think that some people through aways books. I think that book swapping is very popular in some countries, and besides, I believe that ebooks are more popular, so people buy fewer printed ones. I also prefer reading ebooks and electronic info; I like it more because it's easier and faster to find. For example, I needed to prepare for my lecture, and for that, I needed some info about the importance of Beowulf. I can't imagine going to libraries and looking for the info there. In a minute, I came across https://freebooksummary.com/the-importance-of-beowulf-in-modern-america-1272 where I found everything I needed. And what is more, I can save the link on my phone and have access to it at any time, and there is no need to take a whole book or something with me. It's more convenient and ecological to use electronic resources.