Mozilla removed DNT as of Firefox 135, after 13 years since introducing it in 2011 with Firefox 4

In 2024 Mozilla acquired Anonym from former Meta executives and decided to introduce PPA: https://hn.algolia.com/?q=privacy+preserving+attribution

The problem of DNT is that Internet Explorer 11 set it to true as default, and then all companies started ignoring it on purpose.

DNT tried to do this without any legal backing which was obviously stupid.