What is the lowest-effort thing you’ve done that actually put money in your pocket?

I’ve been looking around and it seems like the only real "low-effort" options left are:

Microtasks and different surveys: Using apps like Swagbucks or Prolific during downtime for a few bucks.

Renting your stuff: Putting a spare room, a parking spot, or even a camper on rental sites.

Selling digital goods: Making a template or a stock photo once and letting it sell itself.

User testing: Getting paid to click through a website and say what you think.

None of this is going to make anyone a millionaire, but it beats destroying your car for pennies on a delivery app.

Is there anything I’m missing that doesn’t require a master’s degree or 10 years of experience?