Earlier quoted context omitted.
Which TLDs allow users to registry arbitrary.arbitrary.tld other than .name?
I read the PDF, and thought I understood, but you're asking a good question. I did some research, and it turns out that when .name launched in 2001 (under Global Name Registry), it used this really weird shared-SLD architecture where the registry retained the second-level domain (e.g., rpdillon.name) and sold independent third-level domains (e.g. bob.rpdillon.name and jane.rpdillon.name) to completely unrelated indiv…
Basically, .name came out of us starting out as a webmail provider offering people to pick from ca. 60k domain names covering most common last names, because one of my co-founders and I both had firstname@lastname.tld email addresses.
When ICANN opened up for new TLDs we decided to try to offer the same more broadly.
So it wasn't just the registration, but initially also email forwarding..
None of the first batch of TLDs did as well as projected, and demand for .name was well below what we'd hoped, sadly.
For .name, it was a match of less demand than we thought and people not getting the third level thing, which led to eventually abandoning it as the main offering (after I'd moved on).
We ended up selling to Verisign a few years later.