Slow down: are you seriously trivializing the fact that the food industry was able to very expensively sue someone over criticizing their product ... when she turned out to be correct ... just because she eventually won?
I mean anyone with money and time to burn can sue people. This isn't unique to the food industry, this is just SLAPP which is a much more general problem.
So while you're right it sucks and it's bad that they can do this, it's not specifically a "big hamburger" problem.