Seems like a neat idea for a search engine, but I tried with photos from 6 different cameras and none of them stored the serial number in exif. I wonder how many models this is actually useful for.
I tried a photo taken with a Fujifilm Z37 which is on the supported list. However, the photo didn't display a serial number on the EXIF data. I'm pretty sure I've never seen an option in a camera to not write just the serial number. Perhaps the list isn't 100% correct?