Do you remember Hashocean? It was a very popular scam Bitcoin cloud mining website that lasted for a very long time, people even sold houses, bought Bitcoins and invested in Hashocean and then when they collected the most investments, they disappeared. I remember that they collected so many Bitcoins that their sell-off affected Bitcoin's price in 2016.
Sounds familiar to me, although in the past 8 years there have been so many scams related to cryptocurrencies that someone could write a very extensive book about them. However, given that the price of 1 BTC in mid-2016 was around $400 (if my memory serves me well), and that by the end of the year it had more than doubled, I would not say that the scam had any significant impact on the price of BTC.
If Hashocean affected Bitcoin's price, this 4.4 billion sell-off will have a significant negative effect on price. 900 Bitcoins are mined per day, the US is selling number of coins that will be mined in 77 days with current block reward. The short-term negative effect is definitely here but if they decide sell, it's a very good signal for holders to sell Bitcoin immediately and wait for the dip because there should be a good deep and recovery will definitely be fantastic because the post halving effect will be in action in a few months.
You miscalculated a bit, it's not 900 BTC (approximately) per day, but only 450 BTC considering that the mining reward was reduced by 50% at the last halving from 6.25 per block to 3.125 per block. In addition, I think that about $4 billion worth of BTC will not have any significant effects on the price, because not so long ago we had $3 billion worth of BTC sold by the Germans and no disaster happened.
Btw I bet that their CEX of choice will be Coinbase.
Very likely, it is no secret that CEX has very good relations with the US authorities.
