Soylent Green, wouldn't surprise me mate.
But if there was anything well dodgy, wouldn't a rival company or conscientious scientist or governement agencies test it and report them if there was anything truly toxic in it? (Other than the usual MSG shite and 'animal derivatives' they probably don't even allow in some pet foods, lol.

Basically, it would be too easy to have an international scandal on their hands if their meat was deadly. Trillions of fines and lawsuits.