Because DDG acts as a privacy screen and doesn't tell Microsoft what I personally search for. They are, as you note, fairly pointed about this being their purpose.
> I'm half kidding, but seriously "duck duck go"? What kinda goofy ass name is that? No wonder nobody takes it seriously.
It's a play on a commonly-known phrase (duck duck goose), and while this is all subjective I don't see how it's any weirder than anything else in the space.
People just gotta have excuses to love their favorite corp products. People should just own it, but they feel a little guilty so they have to find an excuse.
It's like Firefox haters, they find one little bug or one negative thing happens, and "Welp, just might as well use Chrome." If Firefox isn't 100% absolutely perfect, then people say they're clearly just as bad as Google.
They say DuckDuckGo is just Bing, and has a dumb name, so it's clearly no better than Google. The truth is that they fucking love Google's products, integration and ecosystem...