I got excited for a moment reading the title thinking it was referring to (disposable) DNS Root Servers, since that is the only context in which I have heard about “root servers” before.
Always stuck me as a clunky term, but it was where my head went first on reading the title here (then I thought DNS servers, but that did not compute so the first thought "won").
There’s a bunch of these comments. What would a disposable root DNS server mean? Stand up a DNS server and just claim authority for .?
You could do that here fine I imagine. You have root. Until you log out, of course.
If you can install stuff and listen on 53, you could make your own private DNS tree anywhere.
Now, managing delegations will get weird if you want to delegate outside of what you manage. I’m seeing a spiderweb of stub zones.