To a legal inquiry via search warrant? Probably not unless it's operated in a country that doesn't have search warrants, but that sounds more like a lawless wasteland.
Getting everyone to agree not to peer seems like a rather tall order.
Darknet Diaries has an (excellent, as always) episode about it. If it wasn’t that podcast it might have been Malicious Life.
https://www.newyorker.com/magazine/2020/08/03/the-cold-war-b...
https://arstechnica.com/tech-policy/2012/03/sealand-and-have...