You can take a look to https://steemit.com/@checkthisout/transfers and you can see the maximum abuse in using bot but this account work for you @grumpycat to promote @grumpycat posts.
This is my post no older than a day who downvote by this nazi @grumpycat .
https://steemit.com/resteem/@dumitriu/free-first-10-user-last-post-resteem-76-to-1200-stemmians-please-be-original-if-not-i-will-not-resteem-your-post
Upvote and resteem your post .