I think that this will not be effective in reducing the level of gambling. This is because some clubs or players are sponsored by casinos or gambling sites. A ban on such advertisements could still be an effort to reduce gambling, but we do not know its effectiveness.
Since this regulation has already been issued, shouldn't the government also be able to assess whether it has been effectively implemented to this day or not? They should have a monitoring system to measure the effectiveness of the regulations they implement.