I guess it depends on the book. Maybe a publisher has to actually put some metadata in a book. Maybe it's just some keywords.
So far I've seen it in one book, Brain Rules by John Medina. Turned it off. It's distracting and I don't want to be told to explore Kobo's store while I'm reading.
That said, someone actually exploring a certain field might find the feature useful, even though I'd guess an actual bibliography by the book's authors might make somewhat more sense.
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