What type of scam is this?

I've come across a user who is upvoting his own comments to a post over 1 year old and keeps replying to himself and upvoting a .

That's it, his reply is a . and he upvotes himself between $3 to $1 each .

This is the user here https://steemit.com/@paco

Here is one post with over 400 comments and self upvotes https://steemit.com/steemit/@paco/power-up-meme-holy-batman

Here is another with 200+ comments and self upvotes https://steemit.com/art/@paco/discover-kevin-winger

Scum of Steemit