"Many sites do not respect this indication of a person's privacy preferences, and, in some cases, it can reduce privacy," Mozilla said on the updated DNT support page.
"As a result of the lack of consensus on how companies should operationalize the DNT preference, most sites do not respond to DNT as a consumer's choice not to be tracked," the Future of Privacy Forum noted.
Global Privacy Control, or GPC, came to the forefront of online privacy as a replacement for DNT... leaving it a purely optional measure that no one had to actually pay attention to.
The legislative landscape has changed since DNT was introduced to make GPC's enforcement more practical. California's Consumer Privacy Act and the EU's GDPR both include requirements that companies respect an individual's desire not to share data.
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