This is the best summary I could come up with:

The data is unnecessary for processing notifications, the researchers said, and seems related to analytics, advertising, and tracking users across different apps and devices.

It’s par for the course that apps would find opportunities to sneak in more data collection, but “we were surprised to learn that this practice is widely used,” said Tommy Mysk, who conducted the tests along with Talal Haj Bakry.

For one, Apple gives app developers details about what’s going on with notifications directly, so there’s no need to collect additional information if you know what happened after you pinged your users.

Furthermore, a lot of the data that apps are collecting seems unrelated to analyzing how well notifications are working, like your phone’s available disk space or the time since your last reboot, Mysk said.

Mysk said if a company like Google can send you a notification without snooping on other details, that suggests there are ulterior motives for the data collection he spotted.

Unfortunately, you might have heard that big companies sometimes tell lies, which would get in the way of that solution, and Apple doesn’t have a stellar track record of enforcing similar rules.

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