I think it has more to do with this: > There is an existing process for allocating names under '.arpa.' [RFC3172]. No such process is available for requestin

I think it has more to do with this: > There is an existing process for allocating names under '.arpa.' [RFC3172]. No such process is available for requesting a similar delegation in the root at the request of the IETF, which does not administer that zone.