I've seen this in old paperbacks. In the middle a lot of times there would be an insert - often for some sort of book club, but in one case I remember an ad for cigarettes.
But I guess this might be the next big scam on Amazon (and other book sites, even Feedbooks now). People taking PD books and stuffing them full of ads and uploading them. I guess better than trying to sell PD books, but only slightly better.
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