Many don't know about DuckDuckGo and even more don't care.
I should say that DuckDuckGo is generally much more strongly censored and controlled than Google. This won't affect people in say, the US. But in many places around the world (like my country of South Korea), using DuckDuckGo is not realistic as a daily driver without using a VPN or making heavy use of the "!g" bang to fall back to Google (which doesn't blanket censor words). Overall it makes it less accessible.
And I know, part of the reason people use DuckDuckGo in the first place is to avoid region-aware results. But that does not change their censorship policies.
Ironically neither GNU nor Linux has a clipboard (well GNU Emacs probably has like 37 of them for some reason). "Primary selection" (the other clipboard that people don't tell you about) started off on X11, which of course had to implement by XFree86, which became Xorg, and then it copied (ha ha) by other non-X-related software like gpm and toolkits like GTK when using Wayland.