When a restaurant closes that is functionally identical to every other franchisee, like an Applebees, Olive Garden, Burger King, etc., it doesn't need a remembrance because you can just go to a different one. Like, if there are twelve identical clones of you when die, is it really an occasion for mourning?
Even chain restaurants can be special to people. Maybe it’s the McDonald’s across the street from school where everyone hung out after class, or the Denny’s that was the only place open at 2 AM in college. Maybe you met your first love at that corner Starbucks, or celebrated a business deal at that Applebees next to the hotel on a work trip.
There’s plenty of ways that people and events can make an otherwise unremarkable place memorable.