The writing is usually plain as day to see. Sometimes, even explicitly so, as stories come out years down the line, like with Amber Heard.
If you'd rather not look at the writing on the wall, okay but don't label people who do as cynical. For example, there is a reason why most young actresses' careers dry up once they reach a certain age and it's because the one and only thing that kept them in the industry was their desirability to their employers. Not the audience. Because there are plenty of roles for older actresses. I mean, hell, here we are still jonesing over DB and she is 43. So, clearly, she still does it for the audience. But it's the employers they have to keep happy and well, there are entirely too many young actresses to compete with who are far more "eager" than they are.