And how much bitcoin do they own? There is money and there is money.
One source states "Around 8% of all the Bitcoin in the world is owned by governments and companies."
The hardcore, anti-establishment bitcoin army is not going to give up their BTC easily and there is little bitcoin left to scoop up (whatever is being traded on CEXes + what's left to be mined).
BlackRock by paving the way to institutional adoption and pumping the price will shift the balance of power towards the aforementioned bitcoiners and away from itself.