what about the chips? if banknotes were the cause why the virus spreadout, the chips can also be the cause. its going to be risky for a gambler out there. he would surely miss his gambling habit if he is quarantined. its best to just do it online and stay home infront of the desktop or he can do it in the phone while watching corona virus updates.
Chips look to be fairly durable. There's no reason why at the end of the day they aren't put into the Casino equivalent of a dishwasher and get a clean - even if it's only a quick rinse-off.