Your kidding right?

That is a factory defect

Error. Looks like the slicer blade was a little dull or the book shifted during the process. Return for refund or replacement.

This is not defect, this is die-cut or “roughed” or roughly “SAWN” or roughly “slit” edge book,
this is done for decorative effect,

Looks like a deckled edge to me. Google it and look at the images. It’s been around for lots and lots of years (maybe 100’s) and is considered to be an extra - like a sewn in bookmark. Not many paperbacks have them.

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It’s generally seen as a feature. It makes the book feel older.

It could be a “Deckled Edge” which some high end or fancy books have…Its a book binding technique

But from your photo its hard to tell

I agree with combinola and others who identify this as a ‘deckle edge.’ In early book manufacturing volumes were issued with uncut and uneven edges. This a modern attempt to reproduce that look. Your image also shows a paperback which folds over at front and back suggestive of a dust jacket (aka: French fold). This is also an attempt at sprucing up an edition. The cost of producing hardcovers has gone up and sales have gone down so publishers, especially outside of US, have gone to volumes with these features instead of hardcover editions.

Typical amazon, nobody needs to know anything about the products they are selling. I mean…

Its called a deckle edge. It mimics the old bookbinding process where pages were laid by hand and thus - uneven.

extremely common

definitely not deckled. bad production. go for the refund