Not sure why you think everyone would hear about it. I tried to let one place know that I thought the pimento cheese might be bad (to prevent others from being sick), and they just looked at me--no offer to check it, report it, tell a manager--nothing. And if twenty people all got sick from one place, how many places actually tell the restaurant? And does the restaurant go tell everybody?? Well no. So no, you won't likely know.
And I can also say that twice I was doubled up on the floor, to **** to even stand up to puke my guys out, within an hour. Went from perfectly ok, to that, within one hour. That may not be typical, but it CAN happen.
Words like "usually" and "typically" are great; it just really irks me when folks come along to say "well it couldn't have been the food." Because it could.