c is technically the speed of causality. The speed at which perturbations in the fields that make up the universe propagate.
The speed of light is a consequence of this, not the cause. Calling c the "speed of light" is putting the cart before the horse.
Photons (being massless) have 100% of their velocity in the spatial dimensions and no velocity in the time dimension. They move at the maximum speed that any change in the electrostrongweak force can propagate in our universe because they are not free to do anything else.
From a photon's POV a trip across the entire universe happens instantaneously - taking no time whatsoever.
The speed of light is a consequence of this, not the cause. Calling c the "speed of light" is putting the cart before the horse.
Photons (being massless) have 100% of their velocity in the spatial dimensions and no velocity in the time dimension. They move at the maximum speed that any change in the electrostrongweak force can propagate in our universe because they are not free to do anything else.
From a photon's POV a trip across the entire universe happens instantaneously - taking no time whatsoever.