The gas station is not at fault here, and had no way of knowing that the cheese was not safe. Clostridium botulinum only grows in food that is improperly processed, meaning that the can of cheese sauce was not sterilized at a high enough temperature for a sufficient length of time to kill the Clostridium botulinum bacterial spores. This is either an error or shortcuts occurring at the facility that manufactured the cheese.
It is very possible that the company that made the cheese will go out of business because of the liability issues. It won't be the first time a company that sold unsafe food has had to close as a result.
The gas station, however, should do fine. Unless people incorrectly blame the station for something over which its owners/operators had NO control.