I assume this is a goof, but if the remarks from the SF Health Department are legitimate, it's a goof that has officials flustered.
It's an app that allows strangers to finish your lunch for when you can't cram the whole thing down your facehole yourself. My initial thought (beyond "this is a silly joke") is "f-ing nasty, man", but you know, different strokes and all. If someone wants to risk, I don't know, mononucleosis or something for a lukewarm, sloppy Reuben, that's their business. Caveat comedor.
What do you think? Public health hazard? Price discrimination? Recycling? What's the right analytical approach? Is LeftoverSwap euvoluntary?