Of course it doesn't say it in black and white. That's why people use the phrase "in the spirit". The trouble with LendInk is in how the metaphor of a book changes once it's online.

With a physical book, you have to learn that your friend has it, either by seeing it on their bookshelf or hearing them talk about it. Then you ask for the book. So it will happen every once-in-a-while; depending on how many reading friends you have, you might lend out a particular book 0-5 times before the book falls apart.

But LendInk is advertising what books are available, and it only needs to find one owner, somewhere, anywhere, who's willing to lend it to you. You don't even have to know them, because there will be some owners who will gleefully lend anything to anyone. So instead of having to individually learn about the 100 books your friend owns, or the 1000 books that your ten friends own, you just need to show up on LendInk, ask for a book, and get it sooner or later. The books on LendInk are too available.