Some of the rest
Couple of other things.
No road test.
Pass their crash tests.
Have a car that passes the inspection,the list goes on and on.
Plus the 50 million up front in a bank account to secure people not dropping out like flies.
Another thing they are even called "US F1". US? Huh? Team principal is English. They are "US based" but will be operating out of a place in Spain (?), using British engines, British electronics, etc. And while they haven't announced any drivers, the only ones that have been mentioned are a guy from South America and links to some others, none of which are American.
Where is the "US" in USF1? There isn't.