How would this even work?

Can any one explain this?

So I got an email from Robinhood today.

Congrats, Pyromnd You now have access to Stock Lending, an opportunity for extra income requiring no extra effort. At other brokerages, you need $250,000 in your account to participate. At Robinhood, you just need $1.
Get started
With Stock Lending, you can make money without having to trade by earning interest immediately if we find a borrower for your stocks. The value of your shares is fully protected, and you can still sell them whenever you want.
All you need to do is sign up in the app, and we take care of the rest.