First off alochol is a strictly regulated substance and a drug. I hope we're not actually treating speech on online platforms as if it was a dangerous substance.
Secondly, when I go to the store I obviously consent to having my ID checked. What has never happened in my life is that I bought something on an online platform, and one week later the company representative shows up and asks me for my information.
It's one thing to enter some place of business voluntarily, it's an entire different thing for a private company to actually pursue me to my home. In fact, the alcohol store owner has literally no idea where I live, because unlike facebook store owners aren't in the habit of keeping track of my home address.