Be interesting to know how the searchable text was gathered? OCR'd the paper and/or web versions of each comic?? Also be interesting to know how much revenue

Be interesting to know how the searchable text was gathered? OCR'd the paper and/or web versions of each comic?? Also be interesting to know how much revenue this generates (via amazon linked purchases). Doing others (e.g. Peanuts and Mad Magazine) in a similar fashion would sure make it easy to find the perfect cartoon for any occasion!