This is one of the many problems we're trying to tackle at you.com (full disclosure, I work there).

We felt like it's important that you can select your preferred sources and downvote sources you don't like.

For this and other reasons we separate the experience into a private and personalized mode. So you get exactly what you want based on your explicit settings (like StackOverflow code snippets or arxiv papers) and can have hardcore privacy when you want that (where your location isn't used, not even your searches are stored like on DDG).