How a photographer, hired by any specific company accomplishes any HDR photography can differ quite a bit.
The first issue is the range of exposures that are necessary to extend the dynamic range of the final image. The other is which HDR program is being used to process the final HDR image.
If you really need to know, you are going to have to call Microsoft and Google and interview the people who produce their HDR images.
I have had excellent results using an incident light meter to determine the range of lighting in a specific scene and then use that data to determine how many photos it will take to produce a high-quality HDR image.
After I have the necessary frames (individual RAW image files), I have had success using the HDR tool in Photoshop CC. There are stand allow programs that are designed specifically for rendering HDR images from multiple image files which in theory, should produce the best quality images.
Recently, some camera companies have added an HDR feature which takes three exposures in rapid succession (UE, NE and OE) and combines them in the camera to produce an HDR image. In many cases, this feature works quite well