As others have mentioned, bidding bots are already used for advertising. I don't believe that placing ads on the site would bring many benefits to this site. It is much likely that it will drive users away. I don't think that Steemit Inc. will need the money from ads, not to mention that they have already a lot of Steem. Some third party websites like Busy or Chain BB may include ads if they will need it, but in case the market will rise, their money will increase a lot so I don't worry about them :D
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