I'm sure many of you have already heard of the liquidity exploit that is allowing some traders on Steemit to make themselves around 1200 Steem per hour. See here: https://steemit.com/steem/@blakemiles84/two-users-are-gaming-the-liquidity-reward-system-and-earning-1200-steem-per-hour
While reading the thread, and even before, I became very concerned by this exploit, namely because it's allowing these users to become, in effect, a separate class of Steemit user, a superuser class. By having so much more Steem than any normal user could ever gain (even via powering up with BTC), and thus Steem power, these users are in effect (even if unintentionally) silencing users who can't hope to compete with hundreds of thousands or millions of Steem and powered up Steem.
Due to the compounding nature of Steemit, this problem will become worse as time goes on and the superusers accumulate ever more posts and power.
Eventually, posts from normal users will almost never be seen due to how much more powerful the superuser groups posts are.
Ultimately, this undermines the platform in a very major and potentially unrecoverable way.