nip05 is so useless to prevent spamming (never created to prevent spam).

As we can see, spammer uses nip05 service provider.

At least, SP can perform basic cleanup.

#nevent1qqsf277fpyjscwk0tfktksdp29whk59prdegvrnyjhmsqglem3rxjuqpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtcx3dp98