So is that proactive systemic testing put in place because the FDA requires it, or because the food processing facility fears an outbreak that would bankrupt th

So is that proactive systemic testing put in place because the FDA requires it, or because the food processing facility fears an outbreak that would bankrupt the company? There is no FDA for bugs in software companies, which is far less consequential, yet most software companies invest a fairly reasonable amount of engineering time into quality control. So this begs the questions, how much good does the FDA really do?