Many privacy regulations, including the California Consumer Privacy Act (CCPA), require websites to honor users' opt-out choices. To facilitate this process, industry has introduced technical standards such as the IAB Global Privacy Platform (GPP), which aims to standardize collection and transmission of user consent information across multiple jurisdictions. However, it remains unclear whether these standards consistently and correctly transmit user opt-out choices, or whether opt-out choices are respected by advertisers. In this study, we conduct an in-depth analysis of consent propagation under the GPP framework. We collect data from four web crawls across four experimental settings to analyze how widely the standard is adopted, the extent to which opt-out signals propagate from publishers to third parties, and whether these signals reach and alter third-party advertiser behavior. Our analysis reveals several inconsistencies in the implementation and adoption of the standard that result in user consent signals being lost and user opt-out choices not being respected by the advertisers.

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