Some do, others of them post conspiracy theories about what THEY are concealing from us, about what THEY don't want us to know and about what THEY want us to think. Secrets are Trumpanzee Chow.
I gather the actors all pretend to take the premise--which, I suppose, involves finding SECRETS on islands or ranches--seriously. I wonder if they spend their downtime on set drinking beer and laughing their heads off.