Which part of society is obligating a person to continue paying it forward? Certainly not the previous customer, who has already driven off. And certainly not the following customer, who (if you don't pay it forward) has no way of knowing that you got your food for free.
In fact other than you, the only person who knows the situation is the cashier, and they certainly aren't expecting meals to continue to be paid forward - the articles on the topic always mention how surprised they are when it happens. And to be honest I don't understand your social compass if being judged by a random restaurant cashier is that big a burden on your conscience.
And to be honest I don't understand your social compass if being judged by a random restaurant cashier is that big a burden on your conscience.
My moral compass is not dictated by the presence of witnesses. If I'm at a park and no one is there to witness it, I still dispose of trash properly. I pick up after my dog without scurrilously looking around for other people.
One's "moral compass" should be internal, and might also be considered like karma. Most people do things because they believe it is right, not because they are being judged (though there are those people in this world, and they are the ones who dent and run and leave a big doggy steamer cooking in your yard). And in Western society one of the biggest burdens you can drop on someone is the sense of reciprocity.
Ok, that makes a lot of sense, but then I don't understand what you mean by "people obligating the people behind them to pay for the people behind them".
If your moral compass is based on what you believe internally, I don't see how you are being obliged to do something by someone else if that person has no knowledge of whether you did it or not.
In fact other than you, the only person who knows the situation is the cashier, and they certainly aren't expecting meals to continue to be paid forward - the articles on the topic always mention how surprised they are when it happens. And to be honest I don't understand your social compass if being judged by a random restaurant cashier is that big a burden on your conscience.