My point is that GoodReads isn't popular enough for it to be profitable to sabotage (yet). And there's still a threat of something more relevant coming along.

My point is that GoodReads isn't popular enough for it to be profitable to sabotage (yet). And there's still a threat of something more relevant coming along. If they actually wanted to improve discovery for something like prime video/shopping, then they could/would copy what works from GoodReads.