DuckDuckGo doesn't have an instant search at all so even less-than-perfect Google's solution is better than DuckDuckGo's non-existent solution. I don't see what DuckDuckGo could advertise here.
Doesn't matter that they don't offer the exact same search, just needs general principle points to be made.
"We don't believe in censoring the web, so here's our promise to you: our entire service will always work 100% to give you what you're looking for."
"When you search with DuckDuckGo, you know that, no matter what you're looking for, you're receiving our very best."
"We know it's not our place to make it harder to search for certain topics, so we'll keep providing you with the best tools for the job, and leave you to chose how to use them."
