Say you're building a feature for a password manager to import passwords from firefox. You'd want the the firefox decryption functions to be available as library.
Or say you're building a tool to extract data from broken hard drives, partially recovered filesystems, etc. Again, you'd want to have this available as a library so you can import the functions you need and use them in your own tooling.
Normally you'd expect this package to primarily export a lib with a "cli" subfolder that provides a sample CLI tool that imports the lib.
The fact that this tool requires libusb which is solely needed for the useless list usb devices functionality is extremely sketchy. It makes using this tool legitimately harder and only helps attackers.