“The strange part is that of those 7350 URLs, during the time for which I have nginx logs, none of them have ever been accessed, and of the ones that I checked, none even worked.”
Three emails, 7,350 URLs, zero hits in the logs. The sender swears “under penalty of perjury” the notices are accurate, but that penalty only covers the claim to represent the copyright owner. Hardbin.com is now offline. Bulk takedown mills face nearly no consequences, so a hobby project died and not one pirated book went anywhere.