I wonder the same. I rarely side hustle for money doing tech stuff, mostly because I don't have enough mental energy left over after a full day of day-job work.

I wonder the same. I rarely side hustle for money doing tech stuff, mostly because I don't have enough mental energy left over after a full day of day-job work. I suppose for side-hustles it may help doing something that's somewhat removed from your day job. Rental property comes to mind. It's fairly rote, it's social, you can put in as much/little elbow grease in it as you like (barring the rare emergency), but it does generate modest income, it's usually more than just a "hobby". A friend, who doesn't work in finance, is really into the stock market, spends a lot of time on researching companies. That's a kind of side-hustle too I suppose.