There are real potential abuses of privacy, but we shouldn't let those scare us into failing to progress. The fact is, you leave your genetic information everywhere you go. If any restaurant wanted to get into the DNA collection business, they would never run out of material. In the near future, I wouldn't be surprised if some people argued that any genetic material left at their business was their rightful property, and since you made no effort to hide the fact that you were eating off that particular fork, they shouldn't have to avert their eyes from your DNA or deny its association with you. Perhaps on your next visit to any chain restaurant, they could suggest a menu more appropriate to your specific health needs.