Let's face it it's bound to happen. Sooner or later if Steemit grows advertisers will see the potential to access the potential customer base. We already have a bot problem on Steemit what happens when those bots start to be backed by advertising dollars? I ca see the day when you type a post about your favorite beverage and get beer or soda ads. Mention pokemon go and get spammed with cheat and hack ads. Even better mention Steem and get plastered with ads for faucets and exchanges.
Unlike the bots today these bots will have funds at their disposal to combat the so called "good" bots with steem power. Why have one bot when you can power up your own bot army or pay someone to do it for you? The next big product for Steem/Steemit could be and ad service that does just this. Companies buy ads and they use the revenue to deploy bots to do the advertising.
Just another potential chapter of the bot battle that will eventually unfold on Steemit..