As mentioned already, it wasn't that long ago when big corps like banks didn't touch open source or free stuff with a stick. People who worked at those big bank

As mentioned already, it wasn't that long ago when big corps like banks didn't touch open source or free stuff with a stick. People who worked at those big banks, companies like Oracle, etc, back then will be able to tell you that almost everything was built in-house. The problem NPM solves isn't a particularly interesting or challenging problem to solve if you don't try to solve it at scale. They'd just build their own. Then for the couple of packages that are hard to replicate, they'd find a way to sign some papers to get access to the code and push it to their own registry. For everything else they'd just rewrite it from scratch. Short of things like React, it's not all that hard for places with the resources of these big corps to rewrite bundlers, web servers, and utility libraries.