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.
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 …
Regulatory exposure, obligation change, escalation trigger, board-ready language, and recommended action for legal and compliance teams.
Unlock the full institutional analysis — InsightConductAtlas 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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