This is a common misconception: NSLs are a legal tool that can be used to extract certain types of information (such as subscriber information and maybe a little bit of transactional information) that a service provider already has stored on their servers [0]. However, they cannot be used to force a service provider to write and deploy code.

[0] NSLs are not magic - https://www.youtube.com/watch?v=YN_qVqgRlx4&t=20m16s