For the majority of human history, people did not have "one job". Peasants worked on a farm AND engaged in craft work AND trade. Merchants had numerous trade routes. Even nobles controlled several estates and political offices. The concept of where you work for ONE entity that provides ALL your security: maybe 150 years old. It's a historical blip
We used to refer to it as "the social contract" when it was still around: you provide loyalty, the institution provides security. Pensions. Healthcare. Stability. That arrangement fractured about 2008, and we are continuing to act as though it exists. Risk was transferred down the ladder by institutions. Pensions were changed to 401ks (you manage it). Full-time turned into contract work (you take care of taxes, healthcare). Lifetime employment now consisted of quarterly performance reviews (you're always disposable)
Each transfer passed the risk onto the individual. So individuals adapted. They began to create several sources of income. Not that they are entrepreneurial heroes. Because they're all rational actors reacting to changed incentives
The side hustle is just personal risk diversification. Same reason why you do not put all your net worth in a single asset. Same reason why countries have foreign currency reserves. Well, same reason why Bitcoin is there
As soon as you lose faith in one system, you develop parallel systems. The interesting thing is the speed. It perhaps required 15 (or even less) years to turn the one-fits-all career into the many sources of income. That is quicker than most historical institution changes
And the institutions are confused. They desire loyalty yet they do not provide it. They desire attention but offer no safety. They are working under a social contract which no longer exists and asking themselves why people are not keeping it. In believing that one institution will provide you lifelong care was the weird thing of it. That was always the anomaly
