Pretty sure that's a programmer's raison d'être. Not invented here (NIH) syndrom predates Rust.
Related funny anecdote, I recently saw a Show HN post title that made sure to mention the thing was written in Rust, but forgot to mention what it actually did. Priorities lol.
I’m sure it sounds like I’m a Rust hater or something, but I’m really not. I like a lot of the new Rust tools being created and use a few myself (ripgrep, fd, and bat immediately come to mind but I’m sure there are more I’m using). I just find the almost religious fervor of the Rust community amusing.