BlackRock crypto worst case scenarios

When I think of BlackRock, I usually think of them destroying housing markets, buying everything up , jacking up rent and being dystopian In general.

But , obvs if they were to go bull on bitcoin and spark a mass bag pump, I can't say I wouldn't enjoy the gains.

That being said , exactly what type of negatives can we expect from them getting into crypto in a big way?

What specific negatives would this cause ? Just a price increase for people that aren't already in?

They can't control the block chain and can't control what we have self custody over , so what else can they get up to?