This is common in Israel where all but the largest companies (FAANG) give you lunch money instead of free food, so it's a matter of choosing between eating out or ordering in - the cost is the same.
Facebook also lets engineers (and only engineers, oddly) eat out on Wednesdays.
Depends on where you are. At least here in Berlin there's always a special lunch pricing and it's certainly cheaper than cooking yourself most of the time. In our office we always go out for lunch every day. Mostly the whole team in one group.