its also downvoting ppl as well, or at leat it was until just recently
https://steemit.com/doyourpart/@sigmajin/spam-bots-and-retributive-downvoting
https://steemit.com/steemit/@desmonid/s-o-s-i-m-being-targeted-by-a-malicious-downvote-bot#@sunshinecrypto/re-desmonid-s-o-s-i-m-being-targeted-by-a-malicious-downvote-bot-20160728t150
but i think they stopped that with an update
https://steemit.com/steem/@sigmajin/downvote-bots-might-all-be-dead