My domain is actually .ch. I am not entirely sure how this goes, and i highly assume swear words are not what i actually ment. They just reserve their right to invalidate domains a few days in case they are inappropriate (i think that is the exact phrasing they use). This is also true for .eu, .de, .it, .li, .at but i doubt it happens often. Maybe it only refers to using registered trademarks? Dunno

I just tried to look it up. Seems it mostly happens for things like "Trademarksucks" which is afaik illegal (smearing or whatever the law is called) in most of europe.