Non Standard GIBS WMS Access

[rambopenguin]

I am trying to access the GIBS satellite/aerial imagery data using the WMS service.
https://nasa-gibs.github.io/gibs-api-docs/access-basics/#ogc-web-map-service-wms

However the WMS service is non-standard, and apparently only works for ArcGIS? I was attempting to add the WMS server to a tool like Tableau, however the WMS endpoint from GIBS returns a .cgi file instead of a standard WMS response.

Is there a reason it is configured this way? Other WMS tools like the USGS data sets have standard WMS endpoints.
https://apps.nationalmap.gov/services/
Example: https://basemap.nationalmap.gov/arcgis/services/USGSImageryOnly/MapServer/WMSServer?request=GetCapabilities&service=WMS

Just confused why in GIBS it is called a WMS if it doesn't meet the WMS standard?
Example: https://gibs.earthdata.nasa.gov/wms/epsg4326/best/wms.cgi?SERVICE=WMS&REQUEST=GetCapabilities&VERSION=1.1.1