How to make money with NO UPFRONT INVESTMENT?

This is just a scenario.

Imagine yourself with $0.

9-5 doesn’t count.

Some shit I came up with on the spot:

1. Refunding scams
2. Resell demand or become a middleman
3. Become good at a skill offer it
4. Social engineering (like e-whoring, calling for %, sextortion)
5. Resell hot items like replicas or just resell home items
6. Physically steal gift cards from stores (the pre-activated ones though)

What would be YOUR ways of making money with zero money or $10 max investment?