That’s actually a sharp question.
The only thing stopping them is US law.
The federal government legally empowered ICANN to oversee each TLD — such as the one you mentioned: (.vzn)
So it really helps a Free Range ICANN if the president is a tryrant who hates freedom of speech. Such as Obama and especially Hillary:
On January 27, 1998 — ten days after Matt Drudge broke the Monica Lewinsky story — Hillary Clinton told reporters at a White House press conference that the Internet needed an “editing function or gatekeeping function”.
http://www.freerepublic.com/focus/news/1918104/posts
Cruz, Lankford, and Lee Raise New Concerns About ICANN’s Relationship with Authoritarian China
https://www.cruz.senate.gov/?p=press_release&id=2603
[back in March]
It’s very ‘in-depth’ info about the way China had secretly facilitated ICANN — including buildings.
~~~
Strickling lied that ICANN is not moving overseas:
“Back in June 2014, ICANN CEO Fadi Chehade announced, in testimony to the French Senate, that the Board had authorized him to begin, as one of five major initiatives, the creation of a ‘parallel legal, international structure (maybe in Switzerland) for ICANN.’
“These changes were recommended even though some Members of Congress have explicitly opposed this outcome.”
— Rosenzweig [testimony at recent ICANN hearing]
I see. I’m not an expert on this, but I’ve always figured that in an age of wireless technology these Federal regulations are going to become less relevant anyway.