The selling point of DDG is "pro privacy" i.e. non-interference with its users, now that this is shown to be BS, there is no reason to use it. Might as well use Google/Bing for bigger features... But probably something better out there.
> Our privacy policy is simple: we don’t collect or share any of your personal information.
They are absolutely maintaining their promise. There's no evidence on their site that they have a promise of "non-interference of [our] users". Whatever that means.
I read through a lot of articles on spreadprivacy.com looking for evidence to back up your claim, and came up with nothing.
>we don’t collect or share any of your personal information
Their lawyers must have a very specific definition of "share" in mind, since they are definitely exposing that information via how their ad system functions.