The article discusses how modern macOS versions send a hash of each program run to Apple, allowing the company to track user activity. This data can be used to identify patterns and habits, posing a potential physical danger to some individuals. The article also mentions that Apple's new macOS version, Big Sur, prevents Little Snitch from working, making it harder for users to block this tracking. Additionally, the article touches on the topic of iMessage's end-to-end encryption and how it can be compromised through iCloud backups.