The video is a bit misleading here - most CGA composite games didn't use the 2bpp mode at all but instead used the 1bpp mode. This gave 15 reasonably nice colou

The video is a bit misleading here - most CGA composite games didn't use the 2bpp mode at all but instead used the 1bpp mode. This gave 15 reasonably nice colours distributed roughly evenly through RGB space, and was also more consistent between different versions of the CGA card.