There's an interesting disease showing up here in the responses. I accept DDG's statement that this is about a favicon and that they "do not collect or share any personal information", and despite that, I also agree with others that DDG should be on the safe side and just stop doing this small thing. It's just the safer and more moral thing to do (So DDG, as many are suggesting, plz stop doing it. Today is good). But…
It's not one mistake, but several. Other then the initial mistake there is also the sloopy reaction and the fact they just closed the issue without bothering to fix it. And this was 1 year(!) ago. Nothing changed in the meanwhile. Now someone pushed it to public and after just some hours they reopen the issue and promise to fix it.
This is the reason why people react loud, because it works. And often it's even the only way that works.