Not to pour water on things, but after 8 years or so I'm not sure it's growing that well...
After 6 years, Google was doing 200m searches a day.
Google now does something like 4 billion a day. So duckduckgo, after 8 years of growth, has captured about 0.3% of the search market. At that sort of rate, it'll take decades to get any meaningful share, and that's assuming Google stand still, which they won't.
That's assuming you have to own the market. You don't, you just need more income than outcome. It would appear DDG is achieving that. Good for them I say.
That's not a bad share of the market. Their strategy is fairly smart/standard chasm crossing. Capture programmers/tech oriented users first. As long as they have solid growth in that department I wouldn't worry.
But Google also more or less owns the market now. Back then it was anyone's game (and internet usage in tdeveloped countries was growing rapidly, making the market a bit more volatile).
After 6 years, Google was doing 200m searches a day.
Google now does something like 4 billion a day. So duckduckgo, after 8 years of growth, has captured about 0.3% of the search market. At that sort of rate, it'll take decades to get any meaningful share, and that's assuming Google stand still, which they won't.