I don’t think it’s an understatement to say that their reach kind of is. If sanctioned the US government could almost certainly 51% attack any given crypto and redirect funds to whoever they want. This isn’t what happened but it’s laughable to think the US government isn’t capable of tracking down the account and seizing coins.
I doubt they could 51% Bitcoin with any sort of haste. Perhaps with a few year plan. Simply put it’s a procurement issue. There are limited ASICS and they are distributed among many operators, mostly foreign. There aren’t massive ASIC stockpiles in the US just waiting to be purchased. A government 51% attack would probably involve doing a private chip run.
