How could they tell you were on that subreddit? Presumably you were doing it from a separate browser on the phone -- can they really snoop on behavior in completely separate apps?
Indeed they shouldn't be able to know that without deliberately bypassing the phone's security features using vulnerabilities. Maybe confirmation bias is at play here?
> How could they tell you were on that subreddit? Presumably you were doing it from a separate browser on the phone -- can they really snoop on behavior in completely separate apps?
The subreddit was opened in an incognito window, and the native app on the same phone.