I think she mis-interpreted my asking - like I was in favor of it and she was letting me down gently. My all-caps THANK YOU back fixed that. 
Maybe they won’t - At the risk of jinxing it, I’m honestly shocked that Amazon hasn’t allowed it - but maybe they’re too worried about all the copyright infringement lawsuits they’d get saddled with. The biggest stores on Etsy (e.g. Northprints) are selling collections of downloads from libraries. It’s nuts. They get shut down from time to time, but Etsy always lets them back on - naturally.