Don't fall for the lottery winner bias. Some companies just strike it rich, often for reasons entirely outside their control. That doesn't mean that copying their methods will lead to the same results.
And for enterprise sales, you need a salesforce and many multi-billion companies have an enterprise salesforce. And documentation writers, and support staff, in multiple geographies, and events/marketing teams to support customers, etc.
Except it's not. All the big cloud providers catering to enterprises, whether SaaS or AWS/Google/Azure, definitely have large sales forces whether or not they thought they needed them at first or not.
