i've worked at a few startups with catered lunches. where i'm at now, we purposely only cater lunch and not dinner so that people don't feel obligated to stay later. we always have the kitchen stocked so there's food if they do, plus we order extra at lunch so there are leftovers. no one is required to stay and eat, but it helps everyone bond at lunch over non-work related things.
plus, some people go out on their lunch, and come back and eat the food at their desk. win-win. free food, no obligation to work.
We started out with ZC and switched to Cater2.me after a few months. Turns out a better website doesn't translate to better food or service, who knew? Also Cater2.me just updated their site and seems to be putting more effort in on that side now. That makes sense to me. Food quality and customer service should be the focus, not the logo or even the UI.
plus, some people go out on their lunch, and come back and eat the food at their desk. win-win. free food, no obligation to work.