In addition to them there are also countless small to medium sized companies that nobody's ever heard of, that don't experience hypergrowth but have slow and steady growth - especially in the B2B sector. I've worked at some such companies.
HN is sometimes incredibly biased towards consumer tech.
Engineering plastics used in automotive and electronics applications. Styrenes for same.
Automotive OEM and refinish coatings - one of the bigger suppliers. Industrial coatings and paints.
Some of the bigger fungicides, herbicides, insecticides.
Catalytic converter components, battery components, cathodes, etc.
This is exactly what the GP was saying: you're looking at B2C companies as if they matter more, when in reality the vast majority of commerce (but not profits) is B2B.
Oh, you know, it's only largest chemical producer in the world. Oh, I'm sure they produce some very important things, but it can't hold a candle to Facebook.
I do have one concern though.
Established markets are more entrenched, and hearing that smaller companies may have "slow and steady growth" here seems excellent.
Yet emerging markets move incredibly fast, and the goal is to discover those trenches and occupy them. Being held back in such a market can be troublesome.
So this is what I'd worry about.
Well, only if you make it a goal to occupy all the trenches. The EU has realized that it does not want all possible trenches occupied. For example: There is a lot of market share to be had in waste disposal by dumping it in the rivers and oceans. Regulation generally prohibits this, because we don't want our rivers and oceans full of waste.
Capitalist market self-regulation wouldn't have done this without external pressure (regulation, litigation, etc.) because the capitalist market would externalize all costs if it would increase profits.