Paul Graham is the skating coach himself, as from 6000 startups financed by y combinator quite a few were unicorns. it is olympian level, but it there is a system to it.
You can earn by deploying your own labor to facilitate transactions between other laborers, such as by running a job fair, that's completely legitimate, good, and creates value. You can't just take 90% of someone's wages, or rather, you can, and many people do, but it's theft.
Because they believe in the Marxist labor theory of value, where apparently it's theft if someone else uses your labor to make something more than you could make yourself, not understanding the fact that that's not how labor markets and total human collaboration works to make something more than the sum of individuals.