No-one says "cigarettes are censored!", because, obviously, they're not. Same for adult content online. It can still be accessed, as long as proof of age is provided.
No, you are just tracked when you access them - «cigarettes» being, of course, all """controversial""" expressions.
(Already putting children as an excuse for that...)
*** They have censored lobste.rs . The "for adults only site" lobste.rs ***