Is it allowed for all books? I've a few physical books that don't have digital versions, it would be nice to scan them and give the physical ones away.
I tried them and the results were not great. They didn't OCR it (though I think they do now?) and the resulting PDF was pretty much unreadable on my Kindle.
Some universities do this. (Well, mine did at least). I think normally you had to pay, but I new a few people who talked the university into doing it for free for them. They also give you back the original books, spiral bound (they cut the spines off them in order to scan them).
You may be able to find a local university willing to do this for non-students.
They have this system at my local bank branch (I assume it's worldwide though, I hope at least) that you bring in a bag of coins, dump them into the slot and in a few seconds you've got a receipt to get that credited to your bank account. This for books would be great! Books go in, epubs come out!
I don't know how or when that would happen, but it would be glorious.