[hwntw]

So you're actually conflating two topics with that first sentence - since this is a topic from the UK government, we don't forbid alcohol consumption amongst children here (over the age of 5), only bar them from buying the alcohol.

Given the topic at hand, it might be a bit more challenging to prevent children from buying loot boxes, whilst still allowing them to open them - but there is prior examples of a distinction in legality between the two.