[TeMPOraL]

DNT never worked - and never could, because it had no legal backing.

What happened was entirely predictable to anyone who understands how the market works: there were some volunteers who honored DNT while it was opt-in, but that mostly ended when one of the browsers decided to make sending DNT enabled by default.

The industry wasn't, isn't, and is never going to self-regulate itself out of a significant revenue stream. That's why we ended up with GDPR - a proper solution with legal backing - which almost works. It would be working, if EU member states were more eager to pursue violations and issue fines.