I did not know this but I can say I am not surprised. From what I have read cases of alcohol poisoning and deaths of tourists have caused the crack down.
Quote:The Mexican government has long been aware of its problems with counterfeit and otherwise illicit alcohol. As much as 36% of the alcohol consumed in the country is illegal, according to a 2017 report by Euromonitor International.
That means the alcohol is sold or produced under unregulated circumstances and is potentially dangerous. The study, conducted in collaboration with the nation’s Tax Administration Service, found that was an improvement from two years earlier, when 43% was illegal.