It sounds gross but actually has a reasonable medical explanation as the article makes clear. Normally the donor is someone known to the patient, ideally someone living with the patient as they would consume the same foods but more importantly they would be acclimated to the same pathogens and any ailments of the donor would be a known risk factor. But in this case, the obvious questions is: Who is the donor and what health issues or prescription drugs are they on? There's a good chance the donors are employees that work for big pharma corps.