First, Thumbs up for the great work, DDG.
Since the title is self explanatory I would like to expand on the idea. First I should admit that I'm not certain how !bang works but looking at how !hn works I think the bang just use searchyc.com to perform the search. This is ok with searchyc.com because it's results are pretty good. But a problem I have with Firefox addon search is that it doesn't really have great search features. Searching stuff with bland keywords doesn't come up with any result at all. Since ddg does the search well, I'd like if ddg can perform !bang using it's index and algo, at least for the sites with not-so awesome-search.
And also something else that came in my mind just now.
Honestly I have come to a point that I trust DDG with data I want to share on the internet. I trust wordpress, I used to trust google so I put my stuff in their hands without any fear. So what I expect from ddg is to implement a service that store stuff that WE WANT TO be indexed at ddg and let us search through those when we want, Someday maybe :) .
PS : Oh where's my !bang for creativecommons search? http://search.creativecommons.org