All they can do is edit minor things like increase(or reduce) sharpness/contrast/tone/color/exposure/bitrate and other minor things.
They probably cannot enable major features like HDR, wifi station mode, geofencing, remote live view, cloud, or any other major things.
So in essence, they are still in a box and are limited to what they can do without opensource firmware.
My purpose of asking
@mentadent was to try to inform him that Viofo would not be out of the ordinary in not open sourcing their firmware, in which he already clearly seems to be well aware of based on his response to my question.
I never said that it was not a valid question.
I think you must have missed the tongue in cheek joke from
@vvs49 in him showing you those lines of code and matrices of what he changed, including before and after picture for you to discern what changed.
I'm not a coder/programmer, but I still somehow caught his joke and so did some other people that liked his post or replied to it.