A recent post on the website STGRB indicates that people are getting banned from the Goodreads website for apparently, NO REASON WHAT-SO-EVER!. This would imply that where they state in their ToS that they can delete your account for absolutely no reason is the only aspect of their ToS that they actually enforce. Evidently, bullying, harassment and stalking is OKAY as well as CHILD PORNOGRAPHY and ADULTS TALKING SEXUALLY EXPLICIT WITH KIDS is OKAY too. But God help you if you do NOTHING! They apparently do not tolerate that.
You can read about it here. STGRB: Something Rotten at the Core of Goodreads