TL;DR
A user on Reddit offered to sell a database of over 150,000 stool images from an app called PoopCheck, collected from 25,000 users. The developer confirmed the sale, highlighting issues around health data privacy and AI training. The incident exposes risks in health app data handling and underground data markets.
A developer has confirmed he is selling a database of over 150,000 stool images collected from approximately 25,000 users via the AI-powered health app PoopCheck. This revelation highlights potential privacy violations and the underground trade of sensitive health data, raising concerns about user privacy and data security.
The database was obtained from PoopCheck, an app developed by Soft All Things, which uses AI to analyze stool images for digestive health insights. A Reddit user, Ill_Car_7351, posted that he was selling this database, which includes labeled and classified images from thousands of users. When contacted, the app’s developer confirmed the sale and indicated interest in negotiating a deal. The app’s privacy policy claims user data is encrypted and not sold, but the app’s terms and conditions explicitly state that user images and health data are licensed for use in AI training, research, and commercial purposes, including sale to third parties. The discrepancy between privacy promises and contractual terms has sparked concern among privacy advocates and security experts.
Why It Matters
This incident underscores the risks associated with health-related apps that handle sensitive user data. The sale of such data, especially in underground markets, threatens user privacy and could lead to misuse, discrimination, or identity breaches. It also highlights the need for stricter regulation and transparency in health app data practices, as well as the potential for AI training datasets to be compromised or exploited without user consent.

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Background
PoopCheck is a recent health app claiming to analyze stool images for gut health insights, with a community of over 150,000 shared images. Its privacy policy states data is encrypted and not sold, but its terms explicitly license user images for AI development and commercial use. This contradiction has been scrutinized following the recent sale of a large database by a developer on Reddit, who claims to have collected data over several years from thousands of users. The incident follows broader concerns about data privacy in health and wellness apps, especially those involving sensitive personal health information.
“I’ve got 150k+ labeled and classified images of 💩 from roughly 25K different people. I know there’s a lot of value in it (hard to obtain, useful for ML training, cancer studies etc) but not sure on how to move about it.”
— Reddit user Ill_Car_7351
“The database was gathered by real users over the last couple of years. We had 25k users since launch. We’re open to discussing a sale.”
— PoopCheck developer (via email correspondence)

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What Remains Unclear
It is not yet clear whether the data sale has been completed or if further legal or regulatory actions will follow. The full scope of user consent and whether the app’s privacy policies were violated remains under investigation. Additionally, the extent of data anonymization and safeguards in place is still uncertain, raising questions about actual privacy protections.

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What’s Next
Regulatory authorities may investigate the data handling practices of PoopCheck and Soft All Things. Privacy advocates and cybersecurity experts are likely to scrutinize the incident further. Meanwhile, the developer may face legal or reputational repercussions, and users of the app may demand greater transparency or delete their data. Future steps could include tighter regulation of health apps and increased enforcement against unauthorized data sales.

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Key Questions
How was the stool image data collected and stored?
The data was collected via the PoopCheck app, which allows users to upload images of their stool for analysis. The app claims to encrypt data and not sell it, but its terms explicitly license the data for AI training and commercial use, including sale to third parties.
Is my health data safe if I use apps like PoopCheck?
While the app states it encrypts data and offers options to delete information, its terms permit the company to license and sell user data for AI development and research. This creates potential privacy risks, especially if data is sold or leaked in underground markets.
What legal or ethical issues does this incident raise?
The incident highlights potential violations of privacy promises, informed consent, and data security. Selling sensitive health data without clear user approval violates ethical standards and may breach data protection laws depending on jurisdiction.
What are the implications for AI training datasets?
The sale of user-collected health images underscores the vulnerability of AI training datasets to unauthorized access and commercialization, raising concerns about data provenance, consent, and privacy in AI development.