What indeed!
Why what stops law enforcement from simply telling dns providers, with the force of a judges order behind them, that “your” domain should point to their servers which proclaim it to have been seized, or which clandestinely record the comings and goings of “your” visitors?
Has this ever happened in the past, and if so, what resources and mechanisms were put into play to accomplish it? Is this series of events a concern of yours?
These questions and more, not answered by me!