Can't speak for others, but Zig scratches an itch for people like me who started to get fed up with where C++ is heading, but also understand that C doesn't necessarily cut it for higher level gameplay code (especially when working in a team). Zig looks like the perfect way out of this dilemma.

Also, most gamedev middleware is written in C++ or C, and Zig can build those out of the box and directly import C headers so it's trivial to build mixed Zig/C/C++/ObjC projects (and without the hassle of C/C++ build systems).