There's no public options for Airbnb yet. Probably starting in Jan 2021, they will release options.
RichieZ is accredited investor. What that means is he had annual income of at least $200k or at least $1 million in net worth excluding his home. If you're accredited investor, you can buy shares in private companies and hedge funds. He bought his Airbnb options very early; years back when Airbnb was first starting. He said he was the 17th shareholder of the common stock. That's super early. He was basically venture capitalist investing in very risky unproven startup. He just happened to pick one of the best Unicorn companies. But I'm sure at the time he invested, Airbnb was extremely risky investment. Airbnb is household name and a verb in the English language now but that wasn't the case when he invested.
Basically he was very smart and extremely lucky. He hit the lottery in venture capital investing. And he had the foresight and diamond hands not to cash out early and hold his Airbnb investment. I'm sure there are plenty of early investors who cashed out on numerous funding rounds Airbnb did to get to this point. So he deserves every penny he earned. Bravo!