Good things dont scale. Sergey Brin & Larry Page could have been the old Japanese man in the subway station sushi joint making the the best bites of a lifetime for a few hundred humans a day. They decided to go a different route.
If there weren't huge companies offering search APIs, DDG simply couldn't compete with Google (without massive scale of their own). As it is, DDG still provides somewhat weaker results in some cases; it is still my primary search engine on all of my devices, and I like it, but when I'm frustrated by the results, I make use of !g and usually find what I'm looking for.