So, you are using bitcoin's mining revenue to make a claim on PoS coins? Assuming you are correct, here's something you dint consider - most of the PoS coins n

So, you are using bitcoin's mining revenue to make a claim on PoS coins? Assuming you are correct, here's something you dint consider - most of the PoS coins need a starting point - mainly the genesis block. These coins are acquired through ICO mechanism. Example NEO. While the current price is 122 USD @ 8 billion in marketcap. But, it started at 0.3 USD and raised USD 28 million. So, China need not buy now 4 billion of coins now, it could have spent 15-20 million to acquire more than 50% of the staking coins.