As other commenters have shared, there are big disincentives for restaurants to turn people away at the door - they don't get paid, and it is negative experience for both sides (with commensurate brand effects).
Bulk-generating accounts -- email addresses, phone numbers and even credit card numbers -- is a solved problem for resellers.
In New York State, it is illegal to restrict transfer of tickets. Expect the same for reservations as this battle advances.
It sucks being able to not resell a ticket when plans change, but I'd assume that these days, the convenience of being able to do that is more than offset by the amount lost to scalpers.
Yes. Either through simply carrying many cards (see the binders of credit cards in documentaries on ticket resellers) or getting many numbers issued against a single account by a friendly bank. These were popular in the 00's and 10's. I expect both techniques are no longer state-of-the-art.
Bulk-generating accounts -- email addresses, phone numbers and even credit card numbers -- is a solved problem for resellers.
In New York State, it is illegal to restrict transfer of tickets. Expect the same for reservations as this battle advances.