Black rock can get bitcoin next day after selling shares so this is why...

(My main language is portuguese).

In the future this is having low effect in prices

But in the first day. Black rock did a risky and Clever strategy

People sold microstrategy Marathon and bitcoin futures... Everything plunge...

People used this money to buy etf from Black rock

Black rock did not bought the bitcoin so we had an unbalance and bitcoin prices plunge

So Black rock bought bitcoin cheaper to back their previously sold shares