As Patrick points out below, the Bitcoin mining pool "exploit" has been vastly overblown by DPoS fanboys. It's a risk, yes, work is ongoing to mitigate it - but in any case, it's far, far more of an existential threat with DPoS. I don't consider DPoS a decentralized consensus mechanism at all.

I do agree that Hive as it currently stands is one of the least weak DPoS networks, though. (Definitely not Steem though)

Either way, creating an open protocol for social media is an entirely different can of worms.