The results were missing from DDG ecause DDG gets its results from Bing. It is about the active choice to censor which Bing made, not DDG.

You make a good point in the difference in active choice but to say duckduckgo doesn't censor results is inaccurate is it does even if by proxy of where it sources those results from. I do feel this is a no-win situation for DDG and I don't think anyone should hold this situation against them as they seem to be caught up in it against their will.

"A company did something bad. Let's hurt them by continuing to give them revenue."

Because DDG uses Bing's API. DDG's results are literally the same as Bing's.