It gets really interesting when you don't allow apps to see your contacts. Take Clubhouse for example, I never allowed it to see my contacts but it does show me all the people who have leaked my personal info to the app because it's made them auto follow me.

So yeah cool I can see that my boss, 4 ex-coworkers, my ex-bosses ex-wife, and I think a recruiter have all leaked my personal info to Clubhouse.