The banks are closed and Greeks unable to buy Bitcoin.
you can withdraw 60 euro per day or per month, i don't remember right now, so they still can take a tiny portion of their money and buy bitcoin with those
but they will probably need that amount to survive, nobody in their right mind would buy bitcoin instead, seeing the utterly critical situation
It is 60 per day. That means 1800 per month. Quite enough to survive imho.