In NYC, even if you walk in to a restaurant with open tables, they'll often insist on taking your number before you can be seated. It goes through a platform called Resy.

And then (at least around here) they often make you scan a QR code in order to see the menu. It's often not a direct link to the menu, but rather a third party site or a link shortener that tracks traffic for marketing data.

Unless they're going to text me when my table is ready, I give them my first phone # that I grew up with.

It happened to me last week at a small Thai restaurant in Las Vegas.