They only know the names and addresses of Intenet SITES, those are registered.
As for users, those addresses are allocated in bulk, in large ranges. Those name/address pairs are fungible and held only by the local Internet provider for their local operations.
ICANN never sees them. And doesn't care about them. And they cannot see them even if they wanted to...there is no technical mechanism for it.
“They only know the names and addresses of Intenet SITES, those are registered.”
And if something is offensive to one of their buds [note the Swedish Plan ...
http://www.freerepublic.com/focus/news/3394704/posts
... knowing the site is enough to issue a fine. If you don’t pay, you have to hop from site to site like a rabbit.