What Substack Knows About You
Every time you use Substack, you are handing over more personal data than you probably realize. This comprehensive data exposure report reveals exactly what information Substack collects about you, how they monetize your personal data, their history of data breaches and privacy violations, and what legal rights you have to take back control. Understanding the full scope of data collection is the critical first step toward protecting your digital privacy and making informed decisions about which services deserve your trust and your data.
20
Data Points Collected
2
Critical Categories
1
Known Breaches
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Data Substack Collects About You
The breadth of personal information that Substack gathers from its users is staggering. From the moment you create an account, every interaction feeds into a detailed data profile that grows more comprehensive over time. The following categories represent the documented types of personal information that Substack collects, processes, and stores. Each category is rated by severity based on the sensitivity of the data involved and the potential harm if exposed through a breach or misuse by the company or its partners.
Personal Information
CriticalBehavioral Data
HighDevice and Network Data
HighLocation Data
CriticalThird-Party Data
MediumHow Substack Uses Your Data
Collecting your personal data is only the beginning. What Substack does with that information reveals the true cost of using their services. Your data fuels a sophisticated monetization engine that generates revenue through advertising, analytics, partnerships, and increasingly through artificial intelligence training. Understanding these data practices is essential for making informed privacy decisions and evaluating whether the convenience of Substack is worth the privacy trade-offs involved in continued usage.
Targeted advertising based on interests, behavior, and demographic profile
Algorithmic content curation to maximize engagement and time on platform
Sharing aggregated user data with third-party advertisers and data brokers
Training machine learning models on user-generated content and interactions
Building detailed psychological profiles for persuasion and influence campaigns
Selling audience segments to political campaigns and advocacy organizations
Cross-platform tracking across partner websites and mobile applications
Substack Data Breach History
Data breaches represent the most tangible consequence of corporate data hoarding. When a company collects vast amounts of personal information, every security failure puts that data at risk of exposure to malicious actors. The following timeline documents the known data breaches and security incidents involving Substack, including the scope of data exposed and the number of users affected. These incidents serve as a stark reminder that even major corporations struggle to protect the massive volumes of personal data they accumulate from their users.
While Substack has not had a widely publicized data breach, the company collects extensive user data that remains at risk. Smaller incidents and vulnerabilities may not have been publicly disclosed.
Affected: N/A
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Lawsuits and Regulatory Fines
When companies violate user privacy at scale, regulatory bodies and courts step in to hold them accountable. The following legal actions against Substack illustrate the consequences of aggressive data collection practices and highlight systemic patterns of privacy violations that affect users at scale. These fines and settlements represent only the cases that have reached resolution, while numerous additional investigations and lawsuits may still be pending across various jurisdictions worldwide.
Substack faces ongoing regulatory scrutiny regarding data collection and privacy practices across multiple jurisdictions
Outcome: Various regulatory inquiries
Government Data Sharing
Beyond commercial use, your data held by Substack may be shared with government agencies and law enforcement. Understanding the scope and frequency of these disclosures is crucial for anyone concerned about digital surveillance and civil liberties in an increasingly connected world.
Substack complies with government data requests including subpoenas, court orders, and national security letters. Their transparency report shows they receive thousands of government requests annually and comply with a majority of them. Data shared can include account information, IP logs, content data, and metadata about user activity.
Your Privacy Rights
Depending on where you live, you have specific legal rights regarding the personal data that Substack holds about you. Privacy regulations like the California Consumer Privacy Act and the European General Data Protection Regulation provide powerful tools for individuals to take control of their personal information. Knowing and exercising these rights is one of the most effective ways to limit how companies collect, use, and profit from your personal data.
How to Request Your Data from Substack
Taking the step to actually request your data from Substack is one of the most eye-opening exercises in digital privacy. Many users are shocked to discover just how much information has been collected about them, often spanning years of activity across multiple devices and sessions.
To request your data from Substack, navigate to your account settings and look for the 'Download Your Information' or 'Your Data' section. Select the data categories you want to download, choose your preferred file format (usually JSON or HTML), and submit the request. Processing typically takes between 24 hours and several days. You can also submit a formal data subject access request via email to their privacy team referencing CCPA or GDPR rights depending on your jurisdiction.
Consider a Privacy-First Alternative
If the data practices of Substack concern you, consider switching to WeTalkin, a privacy-first messaging platform with end-to-end encryption and zero metadata collection. Unlike Substack, privacy-first platforms are designed from the ground up to minimize data collection and maximize user control over personal information. Every feature is built with the principle that your data belongs to you, not to advertisers, data brokers, or government surveillance programs.
Try WeTalkinRelated Data Exposure Reports
Understanding the data practices of Substack is just the beginning. Explore these related data exposure reports to see how other companies in the social media space handle your personal information and compare their privacy practices. Informed users make better decisions about which platforms deserve their data and their trust.
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