Because it allow for value creation in s digital space. If i spend two months in a game getting some asset i would like that to be recognized so that i could sell or buy that unique item.

Its not about copyright as much as its about trust in the transaction between two seemingly unrelated digital assets. It allows me to trust that i am getting what i actually paid for and not a knockoff.

Watching something like fortnite makes it obvious that there is value in digital scarcity.