Its also in active use by some styles of server load balancers. Keepalived in nat mode is one that springs to my mind. The "nat is evil" objection was a moral

Its also in active use by some styles of server load balancers. Keepalived in nat mode is one that springs to my mind. The "nat is evil" objection was a moral high horse in the IETF around the time that Android adopted this policy. They may have a point but its largely irrelevant in the real world.