“The reason is simple. Spammers and scammers have seized upon ebook piracy as means not to offer illegal downloads, but to gum up the search engines with spammy links that, at best, trick people in viewing a lot of pointless ads and, at worst, try to scam users out of their personal information.”
You may find your ebook for sale on some other, oddball, site. It's happened to at least one of my clients. However, that site may just be fishing (or phishing) for personal information, or to try and get someone to click so the site can then download malware. They don't really have your book - it's just used as bait.
People sometimes suck.