There's "owe" and there's "owe."
If I have a sandwich at a local diner I only "owe" the amount on the bill. I'm not legally obligated to leave a tip. But unless the service was truly miserable (and the waiter/waitress' fault) I leave a reasonable tip.
By the same token, unless the book was truly miserable, I leave a review. Sometimes only a sentence or two, but I leave feedback to the author and some thoughts for a potential customer. If the story was miserable, then I don't -- I don't leave one-star reviews, and rarely leave two-star reviews -- but, since I probably read the reviews that were already there, that rarely happens.
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