He 'technically' didn't use steemit's stake. lol
We froze steemit's stake last week, remember?
He got his friends from the exchanges (binance and Huobi) to help him vote his cronies and took over the chain.
Once the exchanges fraudulently seized the funds they were charged with keeping for their clients and voted in the witnesses for @justinsunsteemit, those witnesses ran a fork that unfroze his funds.
He now has full access to the founder's stake to do with as he will. That's what controls the blockchain governance now, not the exchange's pilfered funds. That's why they're going to power them back down very quickly, to reduce the financial harm to their clients they defrauded when they seized those funds, powered them up, and used the owner's rights to vote with them.