DNT was a failure that shouldn't be depended on for anything. Safari has already removed it in version 12.1 (https://developer.apple.com/documentation/safari_r

DNT was a failure that shouldn't be depended on for anything. Safari has already removed it in version 12.1 (https://developer.apple.com/documentation/safari_release_notes/safari_12_1_release_notes https://developer.apple.com/documentation/safari_release_not...), so if that's the only opt-out mechanism there's no way for Safari users to make that choice. That probably includes all iOS users, since all iOS browsers just wrap Safari. I wouldn't be surprised to see other browsers remove it eventually as well. Like Apple says, it ended up doing the exact opposite of what it was supposed to -- almost nobody obeys it anyway, and it hurts the privacy of people that try to use it by contributing an uncommon factor to their browser fingerprint.