I'm 100% sure none of casinos where the location is infected by Corona Virus is still operating, authorities know that contact among gamblers cannot be restricted, gambling casinos are the first to close when the virus hit the location they are on the category of concerts, festivals and meetings.
Everything is closed, in most countries. But there a chance that in some casinos, like in some cafe and restaurants the same rules: 3 meters between people, and cleaning every hour. Of course i highly doubt for this. Maybe someone knows what in Monaco?
Even here in PH, every buildings and establishment are closed and no single company is excused on enhanced quarantine. @johhnyUA Even you implement social distancing like 3 meters between, there are possibilities that COVID-19 might spread since WHO or world health organization already confirmed the fact that COVID-19 can travel to air in just seconds and it survives in a surface for how many hours. So it's very dangerous to have a contact in each place where a covid-19 positive person went.
So if the government of Monaco is well informed about COVID-19 then the best solution for it is to close those gambling establishments since there are already many positives on covid-19 in that area.