It's not the results. It's that DDG doesn't censor.
(This is based on interpretation of very unclearly worded statements and comments from DDG over the years.)
DDG may not censor results itself, but it inherits the censorship policies of its search providers.
(Disclaimer: I've used DDG as my primary Web search for nearly a decade, and Images since DDG image search came online. I'm strongly critical of DDG's relationship to the Tank Man image censorship issue.)