Earlier quoted context omitted.
All the existing TLDs like .com and .net are blacklisted so that only the TLD owners can register them. The claiming process for blacklisted TLDs uses DNSSEC so there are no third parties involved in the process. In addition, the top 100k Alexa domains are pre-registered so that only the domain owners can register those domains as TLDs (only google.com can register .google). That is done through DNSSEC as well.
This is useful info and should really, really be in the FAQ. Like, right at the top, because I don't think it's clear right now at all what happens to regular domain holders using them for email, their own services, intranets and so forth. If those in the current registrar system have a reliable path to transition/try it out at some point that's a good start. Edit to add: your namebase.io FAQ seems a lot more useful…
Seconding this. I did not pick up on that at all.