This information was reported byWired, which collaborated with 404 Media to produce the story.
It also includes sensitive categories such as pregnancy tracking and religious prayer apps.
The scale of this data collection is staggering.
Most app developers and companies included in the list did not respond to requests for comment.
The discovery that this data appears to originate from real-time bidding is particularly significant.
It shifts accountability toward rogue actors in the advertising industry and the tech giants that facilitate it.
The FTC has recently taken action against similar practices.
