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All the users of Google Books (millions of people) also reap rewards.

And anyone else is free to do the same thing Google is doing.

Am I free to go into university libraries and copy every book they own?

Yes.

Well, no. No, I am not.

Try it. See how it goes.

1) Go to library 2) Check out a stack of books 3) Go home 4) Make copies of them 5) Return books to library 6) Repeat many times

You'll be just fine.

The cheap way to scan books is destructive scanning, though.