In the end it is a matter of which industries the Rust community sees as relevant to gain adoption, and which ones the community is happy that Rust will never take off.
Do you know one industry that likes very much tossing closed-source proprietary blobs over the wall?
Game studios, and everyone that works in the games industry providing tooling for AAA studios.
> Game studios, and everyone that works in the games industry providing tooling for AAA studios.
You know what else is common in the games industry? C# and NDA's.
C# means that game development is no longer a C/C++ monoculture, and if someone can make their engine or middleware usable with C# through an API shim, Native AOT, or some other integration, there are similar paths forward for using Rust, Zig, or whatever else.
NDA's means that making source available isn't as much of a concern. Quite a bit of the modern game development stack is actually source-available, especially when you're talking about game engines.
Do you know what C# has and Rust doesn't? A binary distribution package for libraries with a defined ABI.