Depends what you mean by advertising. If steemit INC decides to display banner adds down the side of the page, we can always use busy.org or some other interface/site.

If I drop one of these at the end of each post;

There's not a lot anyone can or should do to stop me, beyond unfollowing and/or muting.

Maybe Coke is paying me, maybe I really love Coke.

When advertising does arrive, I think it'll look a lot like this.