I think people are right that the motivation is profit, but I'm not convinced it's to manipulate you in any way. I don't think driving you towards SEO'd blog sp

I think people are right that the motivation is profit, but I'm not convinced it's to manipulate you in any way. I don't think driving you towards SEO'd blog spam is really all that profitable to google. My guess is that it's because it's an abusable feature, and that means hiring human moderators for it.