one tactic a "biggie" could use would be to buy into a few whale accounts, and then make the Steemit platform an unpleasant place to contribute to, through a campaign of downvoting content.
@krnel hasn't posted in a week after a campaign of downvoting directed at him; that's a loss to the platform. I also see that @asshole is back, which is going to be a pain in newbie's butts.
I doubt an Institutional Investor would spend much time within the community trying to influence things with down votes. It is to time consuming. They would simply short STEEM and nail it to the floor. Now at <$20 mil this is petty cash to them. Stephen
Easy to outsource
here's an account. now go raise some havoc within these parameters