Both metadata in the uploaded book, and seeing the transaction reversed a few weeks later.

Publishers announce the books they'll be releasing a year in advance,and - seriously, this is a rabbit hole I knew nothing about when I started - people were offering bounties to pirate my book before it was available. I have a Google alert for my books so I can read reviews, so all this chatter was turning up. These are people who had no intention of paying for the work, no matter what, but also seemed to be going out of their way to make sure no-one would have to pay.

You can talk about DRM and clunky websites, but that comes across as post-hoc justification. The pirates seem simply to hate the idea that creators might earn anything, no matter how little.