Several reasons speak in favour of researchers opening up their source code or reusing the Open Code of others. These include:

1. Accessibility and transparency: Open Code is easily accessible and provides a high degree of transparency. It makes it possible to understand and review the processes and results of other researchers. 
2. Reproducibility: Open Code supports the reproducibility of research work. It enables others to examine, verify, and build on previous research results. This strengthens credibility and trust in research work.
3. Collaboration in the community: Open Code promotes knowledge sharing, troubleshooting, and innovation and opens up perspectives for new research directions. By sharing code openly, others can actively contribute to the code, give feedback, build their work on it, and thus avoid duplication of effort.
4. Getting credits for programming: Programmers receive recognition for their programming work.