Yahoo Search is powered by Bing. If you looking at Hong Kong & Taiwan data. It still a quite amount of people using them. It's enough for them for their daily lives. Why not in China?
The tech person who using VPN in China. Have you ever tried to advice 551,615,600 peoples in China to use cn.bing.com?
You already have an option like DuckDuckGo that you suggested in the article.
For most people in China, Google is a luxury brand more than useful.
The remaining 250,384,400 peoples. Your first step isn't fighting for DragonFly in China but flight for Hong Kong & Taiwanese Celebrities can tell you where they from without the word "China" in the TV show.