The linked Global article makes Global Privacy Control sound like DNT… and less global than the label suggests.

Global Privacy Control (GPC) operates as a Do Not Sell mechanism in some US states, such as Colorado, California, and Connecticut. The feature can also indicate an opt-out of targeted advertising or a general request to restrict the sharing or sale of your data.

When you enable the feature, the GPC sends a signal to the websites you visit about your privacy preferences. This signal is intended to give users more control over their data and how the companies can use them online.

This signal is sent via a special HTTP header called DNT: 1 (Do Not Track)

Now I’m about as confused as when Firefox rolled out Total Cookie Protection and it was not particularly total.