You're not factoring in the fairly huge opportunity cost of missing out on a major technological wave, not being one of the early domain experts, not to mention

You're not factoring in the fairly huge opportunity cost of missing out on a major technological wave, not being one of the early domain experts, not to mention all the benefits that come with riding the wave. Zig is perfect for game developers, and being one of the first in the space is going to be an advantage. Also, the product here is actually defined as "Building gamedev ecosystem for @ziglang!" — Zig itself is part of the strategy here.