The insta/whatsapp/plentyoffish model works if you're very lucky with both product-market fit and the technical constraints of the product itself. If you have something that technically scales extremely cleanly, it basically sells itself, and it doesn't need feature churn to retain or gain users, you're golden. I do think more businesses could do with checking whether they do in fact have that lottery ticket before hitting the scale button; there aren't that many examples around.

> Valve

Arguably a monopoly. They've got a product that sells itself with very low infra overheads for the income.

> Hedge funds

Very different model. I don't think the same intuitions apply.