"Censoring" is a word very badly understood and prone to manipulation.
There are a lot of circumstances where suppression of information/opinion is justified: protecting intellectual property and copyrights, blocking doxing, prevent haters from doing harm against others, protection of military secrets or people in danger, etc.
In case someone hasn't noticed, there is a war going on in Europe. That is a circumstance where some of these cases apply.
Also, freedom of speech is a principle applied on the relation of people with the state, an issue for public law. This is about a private enterprise and its relations with its users, subject to the regulation of private law.
If this sounds just like "legalese" to you consider this: a newspaper has the right to select and editorialize the news it publishes, a bookseller has the right to choose what books to sell, a movie theatre or a movie producer also has rights to choose what to exhibit or produce. The same principle applies to what dang does here at HN.
So why shouldn't DDG have the right to choose what search results to display?