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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.
The updated privacy policy replaces one analytics tracking vendor with another. Previously, Substack disclosed use of AdQuick, a pixel-based third-party analytics tracker. The revised policy now lists muxData as the vendor for video metric collection. Both vendors operate on the same persistent cookie basis and serve analytics functions, so the functional scope of data collection and use remains substantially similar in kind, though the specific vendor processing the data has changed.
The updated privacy policy discloses which vendor processes video analytics data on the platform. This vendor substitution may be operationally relevant to organizations that maintain vendor approval processes or data processing documentation, but does not materially change the scope or nature of data collection disclosed to users.
Analytics vendor changed from AdQuick to muxData; collection purpose remains anonymous video metrics.
This change record describes what was added, removed, or modified in the document. Analysis reflects what the updated agreement states or permits. It does not constitute a legal determination about enforceability. Applicability may vary by jurisdiction. Methodology
This change reflects a vendor substitution in Substack's analytics infrastructure. AdQuick, previously disclosed as a third-party analytics pixel, has been replaced with muxData for anonymous video metric collection. From a compliance perspective, this is a straightforward vendor change requiring no material updates to data processing documentation unless the organization's DPA or vendor questionnaire explicitly lists approved vendors. If vendor approval processes are in place, the substitution should be documented; if not, this represents normal operational vendor rotation and poses no regulatory exposure.
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Analyst $49/moConductAtlas provides verified policy intelligence sourced directly from platform documents. All analysis is intended to support, not replace, legal and compliance review. Record CA-C-002684.
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Ad personalization controls removed. Contact scanning added. Advertiser data partnerships quietly dropped. A timeline of every change.
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