No cash mean you can't do anything that has not been validated by the state first.
It means kids will have less options to foul around without the parents checking it.
It means you won't be able to pay in a gay bar anonymously.
It means any new (and hence controversial) political concept will have no way to financially grow to acceptance.
It means no living off the grid.
It means hobo will be even more excluded.
It means in case of crisis, the financial system is paralyzed.
It means if powerful people wants something bad for you, you can't be on the run.
It means easy censorship against unpopular activists or artists.
It means no way to test a weird idea off the record to see if it's worth it.
It means no escape if the gov raises taxes in an unjust way.
It means no workaround for paralyzing bureaucracy.
It means no grandpa selling his home grown vegetable at the farmer market on the side.
It means everything you do, where you do, at what time and with whom is tracked, permanently recorded, then passed to algo or AI for analysis.
No grey area. No margin of error.
Just the immovable, inflexible structure of current society imposing itself to everybody.