Well, it is zero sum, but the actual limits are unimaginably vast. Though, there is a very high energy barrier to exploiting the resources of the entire universe. Let’s at least get to Mars, first.
There’s the matter of supply and demand. Nothing comes out of nowhere. When you create a thing, you demand some resources, and then the next person has to pay more for the same resource. Even for a creative output from yourself, you need food and shelter. (And what a controversy shelter has become, in the San Francisco Bay Area.) In the ideal case, the resources you consume enable you to create more wealth than you cost to the rest of society, and thus society benefits. (Not the now homeless person in San Francisco, though.)
Technology is sort of weird in that consumption actually decreases costs, in some situations. The semiconductor companies are paying exponentially increasing costs for state of the art fabs, and they need to keep the fabs selling at peak capacity to make a profit. Also, software is merely knowledge, with very low reproduction costs, so a small production of software can be consumed on a vast scale across the planet, and facilitate the production of more software, enriching people’s lives. This does not make it easy to reward the creators fairly.