https://duckduckgo.com/traffic
Some serious growth.
The thing is, in the past, using a privacy search engine meant making sacrifices. But IMHO, for most daily queries using DDG is no sacrifice: it's fast, clean serps with fewer ads, you have all these special boxes that show up with how to or wikipedia info cleanly displayed, and you get to whatever you are looking for in just as many clicks as using Google without anybody spying. There is no hardship involved in using DDG unless you are a hard core researcher.
Plus they have found the one niche were Google is vulnerable and getting more vulnerable all the time. Google is trapped because they don't dare change.
DDG has played their long term strategy very well.