My guess is that it started as a differentiator in the market. This is 'fun', other things are not. Then it leaked into other places, such as the workplace whic

My guess is that it started as a differentiator in the market. This is 'fun', other things are not. Then it leaked into other places, such as the workplace which became increasingly infantilized at ultimately the detriment of the worker (benefits include: shitty health insurance, ping pong tables and foosball leagues!!). This further led to the internalization of natural negative or neutral feelings: you feel down? What's wrong with you? Everyone else is having fun! This is fun! Your job is fun! You must be broken, therefore you need to fix yourself.