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La Lampara does not exist. This is a demonstration site: the restaurant, the address, the contact details, the catch and the prices are invented. The page below shows where a real document would sit and what it would have to cover, and it is not a real document. For the same reason you will find no VAT number, no company registration and no registry entry here: inventing one is the only thing on this whole site that could actually hurt somebody.
How many this site uses
None. There is no banner because there is nothing to accept, and it is a checkable claim: open your developer tools and look.
Why there are none
Nothing needs to remember you. What you choose on the menu lives in the page address, which is the right place for it: it goes when you close the tab and it follows you nowhere.
What a real restaurant would change
Probably nothing. A restaurant that sells tables over the phone has no need to track who reads the menu, and most of the ones doing it do not know they are.