I live in a city and don’t have enough cash/room for hundreds of books in my apartment and don’t usually have time to reach a library branch. But this way I get/return books instantly and I don’t have to lug anything around on the subway. I read ebooks faster for some reason, too. No way to drop the book in a puddle or pour coffee on it. And finishing a library book on my phone is one of the rare times I feel like I actually used my phone to get something done.
I love tech when it cuts down on the number of objects I need to own or schlep.