The laws of thermodynamics apply to everyone equally.
This is why the efficacy of every single contraceptive method isn’t way higher than it is. Lots of them should work almost perfectly… but the harder they are to use correctly, the less effective they in-fact are.
But saying the patent owners shouldn't be allowed to reap the benefits of their investment is ridiculous, especially when it's completely possible to lose weight in other ways. 6 years isn't that long to wait anyway.