Do these enterprises employ robots? Do companies not open source internal projects? Do companies not hire people to work on open source projects?

The "community" is underpinned by corporations. If you look at the top trendy languages they're generally created or heavily supported by large corporations.

It's not all about the music, man.

> Do companies not open source internal projects? Do companies not hire people to work on open source projects?

Unfortunately they do not for the most part. Obviously there are exceptions but they are fairly rare.