It's not that wild if you dig in a little; not every kidney you take out is going to wind up suitable for transplantation. There's some research into expanding the "suitable" criteria:
https://www.kidney.org/news/kidneys-initially-deemed-unfit-t...
> The study tracked 291 kidneys that became available from 172 deceased donors but were at first rejected for transplant between January 2014 and December of 2016. The kidneys were initially refused using code 830, which indicates that the organ was of low quality or the donor’s age was too advanced. The organs were subsequently procured by Southwest Transplant Alliance in Dallas and transplanted into patients on the kidney waitlist.
https://www.nhsbt.nhs.uk/organ-transplantation/kidney/receiv...
> There may be problems with the donor or organ that mean the kidney has a higher risk of failure than you or your transplant team are willing to accept. You may have problems, such as a recent infection, that makes you unsuitable to undergo transplantation at that time.