Disclosure: I am the Director of Engineering at Tock. We power the reservation system at Eleven Madison Park which Will and Daniel own. The notion of a user's past history with rich data has been something high end restaurants have been trying to manage either via spreadsheets or via custom crm implementations. What we have done is to make that easier through product design and machine intelligence to bring it to mor…
a) you spy on your guests
b) you cross reference with other data sets without your guests knowing
c) you do this for improved revenue
I'll make sure I never eat at restaurants using Tock. Good look seting up proper opt-in once you serve EU guests after May 2018.