The Do Not Track ended up being used for tracking and identifying users. Support for it is now removed even from Safari, https://webkit.org/tracking-prevention/
> Removed the Do Not Track flag, which ironically was used as a fingerprinting vector, adding uniqueness to the users who had enabled it.
> Removed the Do Not Track flag, which ironically was used as a fingerprinting vector, adding uniqueness to the users who had enabled it.