However, while performing a security audit of the DuckDuckGo Privacy Browser, security researcher Zach Edwards discovered that while the browser blocks Google and Facebook trackers, it allowed Microsoft trackers to continue running.
DuckDuckGo CEO and Founder Gabriel Weinberg confirmed that their browser intentionally allows Microsoft trackers third-party sites due to a search syndication agreement with Redmond.
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https://www.bleepingcomputer.com/news/security/duckduckgo-browser-allows-microsoft-trackers-due-to-search-agreement/