Microsoft is too sophisticated to plead ignorance; they are responsible for that outcome and I think we can assume they knowningly chose it. (Though now Microsoft browsers are such a small portion of the market that it doesn't matter.)
The biggest failure of DNT was browser makers - including Mozilla - removing it. It has zero performance impact (1 bit?) or development cost. As long as it was out there, when there was momentum against tracking, advocates had evidence of both demand for privacy and of trackers ignoring user wishes.
The biggest failure of DNT was browser makers - including Mozilla - removing it. It has zero performance impact (1 bit?) or development cost. As long as it was out there, when there was momentum against tracking, advocates had evidence of both demand for privacy and of trackers ignoring user wishes.