Should I optimize for DuckDuckGo.Com?
A niche market is as such because it provides a specific product or service to a specific sector of the market. Although you might not be drawing in the stampede of customers and new consumers, you will be consistently pulling those outliers into your reach. With nearly any niche market, the competition is thin and you're one of the few to offer what that consumer needs—which is a good thing.
A new niche search engine might not have the sticky grip that Google has over the search engine world, but DuckDuckGo isn't a search engine you'll want to gloss over. It serves the "privacy cautious searchers", is fast loading, and has good quality search results.
Mike Hodgdon- SEO & Digital Marketing Expert Consultant