I can say, as a SysAdmin, I have been taught and tell my users to check the domain to verify a website is real.
It's a strange edgecase that the owner of John.Doe.com does not need to own Doe.com
In every other case that I know about, to own the Joe subdomain of Doe.com, you would need to own Doe.com
edit: I guess I've gotten so used to the government 3LDs I just don't even see them anymore, or just see something like .co.uk or .edu.us as a TLD by itself, but yeah those exist too. Still the exception to the rule
It's a strange edgecase that the owner of John.Doe.com does not need to own Doe.com
In every other case that I know about, to own the Joe subdomain of Doe.com, you would need to own Doe.com
edit: I guess I've gotten so used to the government 3LDs I just don't even see them anymore, or just see something like .co.uk or .edu.us as a TLD by itself, but yeah those exist too. Still the exception to the rule