The market follows its own version of natural selection. Companies which adapt best to their environment are more likely to survive.
The surviving species are the ones who can do more with less. T-Rex had claws, thick skins, an imposing size, and dense bones. It can easily crush a cockroach, and yet, cockroaches are not going extinct any time soon. Even humans are not nearly as prosperous as: cockroaches are at least 320 million years old, whereas the Australopithecus lived around 4 million years ago. The reason is quite simple: a cockroach doesn't need much to live and reproduce. In a sense, minimalism is the key to strive.
A good founder wears many hats during her early days: marketing, programming, finance, maintenance, support... acquiring information is the best way to stay afloat. If you start hiring people right from the start, your burn rate will soon grow too big to sustain. Stay frugal, as long as it remains sustainable for you. What matters is not how much revenues you make, it's how much profit you can keep. Sustainable growth doesn't happen when you consume too much or too little, an healthy balance is required. The more you spend, the harder it is to cut those costs. On the contrary, learning to quickly grasp new information and to move fast can only benefit you on the long run.
Huge mega-corporations are no different. They attract and hire top talent who can produce much more value than what they cost. In some aspects, Google-sized companies are even leaner: it's well-known the code base at Google is stellar for example. The iteration speed is not bad either: 13 products killed in 2019, 26 (!) in 2016.