You can't float the entire US economy along, shutter all of the businesses but keep people employed on government loans without ramifications. We should be in a terrible recession right now, but of course the government stepped in to prevent that from happening (mostly).
A functioning economy has a healthy level of financial inputs and outputs: you go to work, you spend X amount of your dollars on entertainment, food, home improvement etc. and you save Y amount.
The problem is when you shutter all of the businesses that just creates a massive surplus of money. That doesn't even get into things like stimulus checks, PPP loans, etc. People don't necessarily need more cash, people really need to produce more and start spending money again.
Too much economic input without enough output.
Needless to say the MicroStrategy investment was really smart and the author doesn't know what he's talking about. 51% attack? Really? So an individual actor is going to spin up computational power eclipsing the country of Switzerland just to take down bitcoin?