It's a courtesy for sure, and I agree, it would be hard pressed to find a 4.0 with no notes, although I believe you! @Professor K
There shouldn't be any other reason I don't think that they wouldn't be available though...
Afaik looking up graders notes is free for everyone, which it used to not be, and other than maybe looking up to many certs per day then idk.
Looking up graders notes is free for everyone now, except if you don't have a paid membership and or are not logged in? Then they limit to only ten or so lookups per day....
Other than that? that reminds me there is this thread that says it may not work if you're accidentally on the CGC Cards division of the registry? Apparently that is the first to come up in a Google search
You need to be here
https://www.cgccomics.com/certlookup/
Which I hope the link works because I am logged in, so for it to work you may need to be logged in as well, I'm not sure 😊