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.

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.