It's absolutely great to see you've figured out the details of it! Indeed, the repository comes with a mix of Python and Rust which need to be built together. We trust our users not to re-build the package with altered parameters for production use (given the package build from sources is slightly non-trivial and takes an hour or two, one cannot really get this wrong by accident...). Then, for learning and non-production use, the BSL under which Pathway is distributed, allows you to do almost anything with the code.