Mining bots there are some programs who are put behind the website and start mining without the consent of the user. One of the big companies that did this lately was thepiratebay torrent website, while you were accessing their site you couldn't notice but they were using your CPU to mine Monero. These are mining bots, usually bad things but can be good one like already mentioned in trading.
Yes, the same came me in mind. Browser based mining without knowledge of visitors. Also scam sites with downloadable software may call their virus/trojans mining bots . Give an example of your "mining bots", so that we can give accurate answers.