> It's Rust's fault. It provides a function in its standard library that's widely used and which aborts the process. There's nothing like that in the stdlibs of Java or .NET

It is the same as runtime exceptions in Java. In Rust, if you want to have a top-level "exception handler" that catches everything, you can do

  ::std::panic::catch_unwind(|| {
    // ...
  })

In case of Cloudflare, the programmer simply chose to not handle the error. It would have been the same if the code was written in Java. There simply would be no top-level try-catch block.