One major exception: distribution. You can also grow big off the backs of other companies. In the tech world, this has become fairly common in the advertising

One major exception: distribution. You can also grow big off the backs of other companies. In the tech world, this has become fairly common in the advertising space. Retargeting companies, for example, can grow quickly by signing up only a few large e-commerce sites. It's worth noting that in this scenario you often don't see regular monthly growth. Instead you get huge spikes when new customers/partners are on-boarded.