That did not happen.
Foods that do contain peanut products/derivatives say so on the label, the majority of foods are unaffected in the process.
For foods that DO contain peanut products/derivatives, the consumer is free to try to find a non-peanut alternative.
I don’t see that as being some sort of great burden/problem for manufacturers.
The same is true of phenylalanine. Foods containing it or it’s derivatives say so. And that is because there is a somewhat rare genetic disorder called PKU, and for people with PKU, even tiny amounts of phenylalanine will either kill them outright or make them spend the rest of their lives staring at the wall and drooling.
Is that a “useless” regulation?
Not if you have PKU. (phenylketylnuria)
It’s pretty easy to know if you have added peanut or Pa to your product. How do you assure that the stuff you buy does not have GMO in it?
For instance, how would you check your peanut flour to assure that the peanuts were not genetically modified?
Well, since it is no great burden/problem for manufactures, how about making the products that have no GMO post that fact?