Hey @jarvie... That is a guy named @fulltimegeek... He is the most generous Steemian on the platform. He has created many ways to give back to the community, including creating the StewardsofGondor, fighting the Whale Wars almost single-handedly, and now creating an army of bots that are used to upvote content he likes (and authors he thinks provide good content).
Here is a recent post by @abh12345 that explains it and you can also go to @fulltimegeek's page and check him out... He's truly an inspiration to many here and someone you should learn about!
If you have any questions, please let me know :)