There are definitely sponsored ads that pop up in a feed by default. Downvoting them doesn't change their placement. There's also reddit premium (no ads, custo

There are definitely sponsored ads that pop up in a feed by default. Downvoting them doesn't change their placement. There's also reddit premium (no ads, customizable avatar, reddit coins) along with a award system where people can give awards that cost reddit coins to exceptional comments. These awards cost reddit coins which can be gained through either getting awards on comments, or subscribing to reddit premium.