Well said. to add to that list, real companies often have to handle taxes, international payments, regulations, laws. Also, enterprise companies (not retail app gimmicks) also have sales forces, contract people, and account execs. Those scale with the growth of the business (hopefully sub-linearly, but still scale.)
The difference you will see on the examples being cited here are those companies existing on ad revenue (or in growth-cash burn mode making no $) -- if you can ignore realities of business then yes you can run lean.
Show me an Instagram or WhatsApp that had global payments, regulations, taxes, etc and managed to do it with 5 or 10 or 13 people -- it does not exisit.
... of a product
> Give me a weekend and an espresso machine and I'll have an mvp.
... minimum viable PRODUCT.
That's not a company. That's a product. A company has to handle abuse, support, sales, marketing, expanding into new markets, partnerships, etc.