It definitely doesn't make it safe, but it does allow you to run a binary and see what it would do to your filesystem, without actually doing it; which is prett

It definitely doesn't make it safe, but it does allow you to run a binary and see what it would do to your filesystem, without actually doing it; which is pretty neat! chroot is completely different because it completely isolates a process from the rest of the filesystem. This is more like, well, a sandbox or overlay.