Well I've totally blown up the security of the only two formerly viable scalable alternatives to PoW which were Tendermint/Cosmos (in general any Byzantine agreement including Casper/Rchain) and Bitshares DPoS/Steemit/Ark (which my whitepaper explains is also Byzantine agreement even though it is hyped as something different):


My whitepaper is going to turn everything upside down. It is going to be a major event, as important as when Satoshi published in 2008.


Note non-delegated PoS is not scalable, so I am not going to debate on it even though it is also subject to a winner-take-all power vacuum flaw same as for PoW.