[sammorrowdrums]

Well you might trust DDG as a good actor but not a third party. To discover that this information is discoverable to a third party (even if un-attributable) would breach their trust in DDG. Whether that's reasonable or DDG are misleading people in that regard is another matter. Personally I still use them a lot, and will continue.

I just think there is a point to be made here. Even generally it's often opaque what third parties have what data and I don't really think GDPR has fixed that. It's surprising for people the Bing might have the contents of their DDG search history, somewhere in the huge dataset of DDG searches that pass through.

Also they might not want to help improve Bing search but I'm guessing they do inadvertently?