Everyone is motivated. It seems to me that Anthropic went out fishing for something to blow up. As Ray puts it: "Management eagerly approved the Rust rewrite option because it was a great marketing opportunity to showcase their new Fable model, Anthropic already uses Rust, and Zig is openly against using Anthropic’s products." Sounds spot on.

Others have pointed to some plausible technical benefits from the port, namely that it forces an enumeration of unsafe code boundaries. There's probably something to that, but the big idea is that Anthropic bet that its models could do a big job, and they needed to both demonstrate that and make hay of it. Everything aligned. They did the port. The artisans might call it slop, but it runs, they did it like 2 weeks, and they stuck it to the guy that shuns AI.

If you're the type of manager who picks farming out work to a body shop with 100 unskilled workers instead of hiring 2 legitimate FTEs, then this is speaking your language.