The only areas that alcoholic drinks aren’t permitted in are Sesame and LOD. Beyond that, everywhere is fair game for drinks, as long as it’s inside the park.
Sesame is actually related to the IP rights contract and is enforced to the best of my knowledge there is no such policy fir LOD so you are 50% right.
No it's not a law but park policy mandated in their contract for the rights to use the Sesame stuff. Also the zone doesn't start at the tracks but at the actual gateway on the right as you are walking towards the skyride stay to the left and no issues go to the right and into the actual Sesame Forrest area and staff are supposed to ask you to leave the area or throw it out and usually do so fairly quickly.Am I breaking the law when I get off the Skyride at Sesame with a beer? Ha.