This is a pretty good example of a thing that is not required to keep the service running reliably (akin to sending an IP packet with only a partial IP) and that governments, with no incentive to properly allocate Earth’s scarce resources, would typically keep running aimlessly.
USPS is a government service but it is self funded, the domain system has evolved a pure unregulated capitalist way of dealing with this dilemma.
Purchasers of domains are simply expected to buy all misspelled and closely matching addresses or a opportunistic advertiser or worse will set-up shop.
Then they tell us we consume too much resources.