Portable to what? Rust works fine on all of today's popular platforms.

I see people complaining about Rust's lack of portability, and it is always some obsolete platform that has been dead for 20 years. Let's be serious, nobody is gonna run Tor on an old SGI workstation or Itanium server.

Don't Rust and Go build to mostly-statically-compiled binaries? (With the exception of a link to libc.) (This isn't a rhetorical question, this is something I don't know a lot about

I'd imagine the biggest cultural reason is that many Rust developers were C developers who had a reason to find something better, but still scoff at garbage collection, large runtimes, etc. They probably have a lot more Rust expertise in their circle.

Another technical reason is that they were trying to replace their C code with Rust in bits and pieces before they went with a full rewrite. I don't know about Go, but this is something ergonomically doable in Rust.

What do you mean? Rust supports far more platforms.

Also Rust has a lot more inherent safety features than go.

(I think Go is great and its my primary language)

and easier to learn.

and better funded.

and easier to find devs.