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Is this some sort of a promo trap? When clicking on book links I get taken to pages like this one http://www.freebie.guru/au/starwars/starwars625.html

That page isn't linked in this post. I don't know that site and won't click that link to find out what it is about.

No it is not, but I get redirected to it on my Android phone after clicking on book covers or graph.

That doesn't happen for me, at least with uBlock on.