You can't know if a public installation of an open source project is actually just running the code that you see either. Hosted open source projects have no security benefits over proprietary services.
And duckduckgo is not owned by yahoo. It has partnerships with yahoo, bing and yandex to use their search databases.
And duckduckgo is not owned by yahoo. It has partnerships with yahoo, bing and yandex to use their search databases.