#Microsoft #Bing censors Tienanmen Square "Tank Man" search results, even outside of PRC (where they are required to censor such results). Naturally, since most of #DuckDuckGo's results come from Bing, #DDG searches are also censored.
This is a good reason for DDG to switch from being Bing results with a little additional from Yandex and Baidu results to either fully independent or at least being more of a metasearch engine.