In June 2010, American Bitcoin developer Gavin Andresen launched a website known as the Bitcoin Faucet.

This site rewarded visitors with 5 Bitcoins just for completing a CAPTCHA — a basic test to prove you're human. You didn't need to pay, mine, or trade anything — just solve a small puzzle.
At that time, the value of Bitcoin was almost worthless — maybe 5 Bitcoins were worth just a few cents. But as Bitcoin's value skyrocketed over the next decade, those 5 Bitcoins became worth hundreds of thousands of dollars.
The faucet distributed approximately 19,700 Bitcoins in total as it continued to dispense coins to users.
The goal was to get more people familiar with Bitcoin in its early days, not to create a scheme to make people rich.
Eventually, the site was shut down as Bitcoin's popularity grew and its value increased, making the distribution unsustainable.