Very likely just boring reasons like not having thought about it, not having made the code in a way that's easy to publish. Think something like he started the

Very likely just boring reasons like not having thought about it, not having made the code in a way that's easy to publish. Think something like he started the project at some point, never planning for it to become this big. It was probably some code written in a random directory, with no regard for whether test fragments are around, whether it contains test data that maybe shouldn't be public, different pieces that are closely tied to a server config that itself is very specific to what he already had running and would need some documentation to be useful etc. pp.