I did a search for the following on DDG:
I expected to get the following page:
But it didn't show up.
I had safe search on and I believe that was the problem as when I turned it on all was as expected.
I had a play around with Yandex and from this I believe the problem is DDG is using uses the Yandex for kids options for the safe search. For adults this is too restrictive so can I suggest DDG gives the option of 3 levels of protection, unsecure, secure and for kids.