What do you mean by hidden rules?

What are the hidden rules? It is some unwritten rules and principles of shady and black-box operation, which originated from people's greed and selfish desires, developed and expanded with the progress of the times, and now it has penetrated into all walks of life in society.

Hidden rules of consumption:

The unspoken rules of consumption refer to self-evident but tacit rules of consumption, which are acquiesced and observed by most people in the field of consumption and become another set of codes of conduct and norms besides relevant laws and regulations. The "hidden rules" exist in some consumer fields such as commercial sales, catering and accommodation, tourism and entertainment, property decoration, beauty, education and training institutions and agricultural products. If you can't bring your own drinks when eating, you have to pay extra for using sterilized chopsticks and towels. ...

Entertainment circle, industry, workplace, school, etc. It can be said that there are more or less hidden rules to obtain the interests of individuals or a few people in all walks of life. Sometimes it violates the law, and sometimes it goes against morality and conscience.