https://www.theregister.co.uk/2019/02/07/apple_puts_bullet_through_do_not_track/

Apple on Wednesday removed the vestigial "Do Not Track" (DNT) privacy technology from Preview Release 75 of its macOS Safari browser, and buried the corpse without ceremony. DNT is also missing from mobile Safari 12.1 in the soon-to-be released iOS 12.2.

The shiny device biz did so, it says, to protect privacy – the presence of the setting could be used as a data point in a browser fingerprint.