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.
it's unrealistic to think that if nostr gets as big as we hope, that we're going to have millions or even billions of individual domain names being registered. could you image? LMAO! people haven't done this for the 40 years that email has been around. they're not going to do it for a nostr address if they didn't do it for an email address.
Spending $5 a year to get yourself “verified” is a big ask? Then why are you charging them 20,000 sats for the same thing! 😆
1) i'm not. it's a one time fee.
2) the overwhelming majority of people will NEVER buy a domain name to host their email address or their nostr address. they just want to click a button and pay for a service that gives them what they want.
If you make it the only way not to get impersonated on Nostr, they will. Your reputation means more than $5 a year.
You can't impersonate me. Only one derekross@nostrplebs.com will ever exist. Ever. Now, some clients don't check the validity of the Nostr address by calling the JSON to verify the ID matches the public key. However, they show an invalid indicator.
What is stopping someone from registering derekross.com and pointing your npub to derekross@derekross.com
My guess would be this guy. 
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Someone could, but that's not the Nostr address that I've been using. My identity is derekross@nostrplebs.com. if you get a new email address, you email everyone and tell them hey this is my new email address. The same goes for your Nostr address. You'd post and say hey this is my new Nostr address. If it's not from the same npub that you've been following them you'd be suspicious. This would be harder for new users that were looking for the correct Derek Ross to follow, but a little bit of work helps to alleviate pain points.
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