EDTA isn't exactly environmentally friendly. What's the point of trading out cancer for mercury poisoning?
I'm not sure you know much about EDTA as it is used in homeopathy. Not a slam. Tiny amounts taken internally aren't carcinogenic. Even gram dosages taken intravenously can be very helpful for treating heavy metal buildup.
Now if you look for stuff on the Internet associating homeopathic EDTA with cancer, I'm sure you can find it. But you can also find reports of black pepper causing cancer too.