Most places restrict the age at which you can buy alcohol and most places seem to restrict it to at least 18. 21 is higher than the average but legal age laws seem to be pretty standard.
And as mentioned in the article the restriction to gaming is being implemented not only in China but in SK and Vietnam, what it is normal and what is totalitarian seems only to reside on who implements it. Usual tribalism dressed-up in sophisms.
Most places restrict the age at which you can buy alcohol and most places seem to restrict it to at least 18. 21 is higher than the average but legal age laws seem to be pretty standard.