Isn't that desirable? Safari (Apple), IE/Edge (Microsoft), and Chrome (Google) all operate their own ad networks. I'm sure they'd love their own version of X-U

Isn't that desirable? Safari (Apple), IE/Edge (Microsoft), and Chrome (Google) all operate their own ad networks. I'm sure they'd love their own version of X-UIDH [1]. [1]: https://en.wikipedia.org/wiki/List_of_HTTP_header_fields https://en.wikipedia.org/wiki/List_of_HTTP_header_fields