No.

A group of privacy advocates and privacy software companies has proposed an “unofficial” specification for how consumers might transmit, and how companies might receive, a global privacy opt-out signal that indicates an intention for information not to be sold.  As of 12 October 2020, the draft “Global Privacy Control specification” claims to have “no official standing of any kind and does not represent the support or consensus of any standards organization.”[1]  The draft specification further states that the “GPC signal” that it describes “is not intended to convey legally binding requests” for information not to be sold, but is, instead, intended “as [a] way to test effective protocols for communicating and complying with user requests to stop the sale or sharing of their personal information.” [2]

[1] Global Privacy Control Specification: Unofficial Draft 07 October 2020 available at https://globalprivacycontrol.github.io/gpc-spec/ (last accessed 12 October 2020).

[2] Global Privacy Control Specification: Unofficial Draft 07 October 2020 available at https://globalprivacycontrol.github.io/gpc-spec/ (last accessed 12 October 2020).