Because there are so many actors in the entertainment industry, no actor is indispensable, which provides a breeding ground for the unspoken rules. Those who do not accept the unspoken rules, unless they have strong backing, basically have no chance of getting ahead.
However, after the millennium, with the prevalence of the feminist movement, the cost of engaging in unspoken rules has increased.
Also, because the Hollywood film industry's operating mechanism is more robust, from project initiation to casting, filming, and marketing, there are mature operational processes, and everyone has their responsibilities.
The executives and producers of the seven major film companies are also just employees; their task is to make money for the shareholders. If they fail to make a profit, they will be replaced, and their power is greatly diminished. They can no longer do whatever they want and give roles to whomever they fancy.