The speed of light c= 3* 10^8 is a fundamental physical constant of the universe. Of course the universe works according to some rules, a general framework. While we haven’t discovered all of its workings, our attempt to do so is science. In this attempt, we come across certain values and limits which are inherent. They do not change with time or situation. The speed of light is one such constant. It is the maximum speed with which any particle can travel. It is maximum in vacuum as vacuum is free space offering no hindrance to motion.
Trying to know why the speed of light is exactly what it is (299 792 458 m/s), is like asking wanting to why gravity is not repulsive? or why the electronic charge exists as as a multiple of 1.6*10^-19? These are constants in the fabric of the universe. They are a sort of limit placed by nature. We cannot change them, just appreciate them and work our way around.
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