Anyone who repeatedly askes for consent when boundaries have clearly been established should never be trusted.
So I ask, why would I ever accept?
To get them to stop asking is never the right answer.
I never understood the point of that. Asking companies who want to collect your data to "pretty please don't" when there's no oversight or accountability should they decide to ignore your plea makes DNT a waste of bandwidth. It's worthless. Even the companies who would respect your choice have to track you long enough to remember that you've asked them not to track you.
Don't bother asking them to stop tracking you, don't even give them the choice. Block JS, block 3rd party cookies, block ads and trackers, delete cookies on a regular basis.
Imagine it like this: DNT is a "No Trespassing" sign.
Do no trespassing signs actually stop anyone from trespassing? No.
In this case, I use it as a tool to judge who clearly rejects my request to not be tracked, not stop them from tracking me.