Earlier quoted context omitted.
Advertisers chose to ignore DNT because they claimed Microsoft making DNT enabled by default took agency away from the user. In reality, they probably weren't going to honor it anyway.
There's an inherent conflict. No one _wants_ to be tracked, there is no direct benefit to being tracked and only downsides. And advertisers want to track you. So there was no way to respect the flag other than making it obscure so only a few dedicated people turned it on.
Advertisers are the scum of the Earth, as someone with ADHD who doesn't ever consent to my attention being stolen in that way. I really don't care what their opinion is, since they're intruding into my headspace without permission