I'm surprised you got a post up, I've been trying to get my morning post submitted for over an hour with no luck.
The probable answer is that someone is upset and spamming the network, like a DDOS attack. It's bizarre to me because you make more money when the price of Steem is lower (because your Steem Power payout is a post reward multiplied by 0.375, then divided by the 3.5 day price of Steem), so it's very likely someone who doesn't actually use Steem.