It's not solely used for scientific and machine learning at any of the aforementioned companies. It is the (or was) chosen by a number of technology companies w

It's not solely used for scientific and machine learning at any of the aforementioned companies. It is the (or was) chosen by a number of technology companies who have the resources and knowledge to select the correct languages to address one or more of their existing problems. That is evidence of use and use case. I would argue moving away from Python at global scale doesn't even negate my point. All products change with scale.