Have you read the whole thread?

The Pharmacist post above should be enough for this question and another thing is there are some bot tools that mostly use on SEO. Mostly plagiarized and paraphrasing are generated from that bots just to earn Bitcoin or altcoin from the signature campaign.
 
Why do they do that? Because they can run multiple accounts on a single bot to spam here on the forum(They can't handle multiple accounts without this bot) and earn easily without spending too much time.