Substack replaced one third-party tracking vendor with another in their privacy policy. The policy previously listed AdQuick as a persistent tracking pixel for third-party analytics; this vendor reference has been removed and replaced with muxData, which collects anonymous video metrics. The practical effect is a change in which vendor processes tracking data on Substack's platform, though both serve analytics purposes.
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Lifetime 2 years Domain .substack.com Vendor Privacy Policy Link Name AdQuick tracking pixel Type Persistent Purpose Third-party analytics tracking.
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Lifetime 2 years Domain .substack.com Vendor Privacy Policy Link Name muxData Type Persistent Purpose Anonymous video metric collection and aggregation.
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(pixel based) Lifetime N / A Domain .substack.com Vendor Privacy Policy Link Name muxData Type Persistent Purpose Anonymous video metric collection and aggregation.
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