Because what you’re referring to as a “website” is a company that performs many functions, and you get to see the website interface to it.
But the background to that may be many, many applications that interact with _millions_ or people a day. Which requires insane amounts of software and hardware, which need to be developed, maintained and repaired by many engineers and other specialist. Not to mention the support infrastructure for those people (i.e., HR, payroll, etc).
Then there’s stuff like marketing, sales, and many other things.
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