The DuckDuckGo application through 5.58.0 for Android, and through 7.47.1.0 for iOS, sends hostnames of visited web sites within HTTPS .ico requests to servers in the duckduckgo.com domain, which might make visit data available temporarily at a Potentially Unwanted Endpoint. NOTE: the vendor has stated "the favicon service adheres to our strict privacy policy.
github.com/duckduckgo/Android/blob/e2f2d54a6b4452277467db403a3546512401b493/app/src/main/java/com/duckduckgo/app/global/UriExtension.kt#L83-L88
github.com/duckduckgo/Android/issues/527
github.com/duckduckgo/iOS/blob/1ae03d7221180bd6791cf6f7f06922a96335cf75/Core/AppUrls.swift#L98-L100
news.ycombinator.com/item?id=23708166
news.ycombinator.com/item?id=23711597