Comment by username90

> Your source code is worthless

This disregards the effect of having users. Once you have built something and lots of people start using it then the code for the library becomes the main source of truth for what that library should do, since any changes to its behaviour is likely to break someone's workflow.

This is why making "clean rewrites" is so hard, since reimplementing all the peculiar behaviour of the previous implementation is much much harder than implementing new peculiar behaviour for a new library with less well defined requirements.

Source code isn't particularly useful for competitors, no, but it is extremely valuable for your company.