Small businesses are bigger than you think they are. A company with $100 million revenue per year could still be a small business.
You might be assuming small businesses have less than ten people. That’s a category of small business called a “micro-business” or microenterprise, depending on funding model.
Different countries use different definitions of what "small business" or "micro business" is. And people usually use their own local expectations they're used to. I'm not from the US and a company with 100 million revenue is far from a small business to me.
In EU where I'm from the micro/small/medium business sizes are tied to both employee count AND revenue. Micro is below 10 employees and below 2 million € revenue, Small is below 50 employees and below 10 million € revenue, Medium is below 250 employees and 50 million € revenue.
So if you had 100 million revenue you would be a large business even if you had less than ten people.
Had to look it up, but instagram had 13 employees when they sold to Facebook for $1 billion (for some reason I remembered them being 9 people). I know multiple gale devs who had single digit (or low double digits) staff when they were already making many millions in revenue/profit.