The information has been corrected....that proposed law was never passed.
The opening hours for all drinking establishments in the country including casinos is governed by a decree issued by Leonel Fernandez as I understand it. Decree 308-06??
Exemptions need to be obtained for establishments to open beyond those hours and it is very normal for hotels to get such exemptions from national laws in development agreements. The question is therefore whether any of the closed establishments did so?
The rest of us living in the country are fortunately protected by a law on closing hours and increasingly it is being enforced strongly.