I suspect that for most people in the US their first meal at McDonalds was purchased by their parents. And they probably know quite a few people in real life that would endorse McDonalds.
That is a pretty much irrelevant point though, use any other example of buying a meal from somewhere that is not as common as McDonalds. On the point of endorsing, people can endorse an app as well so I am still not sure how that applies.