The actual fact that geese can eat that much and double size (or more) is natural and necessary for their migration. It's possible to make foie gras by just letting the goose eating itself. Acording to my parents when they were living on farms when young, that's the way they were doing it.
Just banning the practice of force feeding would make more sense.
You can find a few things online about those alternative way https://text.npr.org/s.php?sId=487088946