Would be interesting if clients provided an indication as to the number of pubkeys a domain is mapping in that nostr.json file. To me, If it's thousands, it carries far less weight then one only serving for say, a dozen or so. Right now I just consider well known ones (nostrplebs, nostrverified, iris.to, nostrcheck, etc) as being a pretty much free for all pay to play. Anyone that's able to pay for relays, support developers and such should be able to spend about $10/year on their own domain and setup their own managed nip05. It's not rocket science. It's more work to setup a VPS, or a typical Site ground website or woocommerce or Shopify store.