I needed a .net math library. My IT department insisted on my trying a wrapper around a Fortran library (I believe purely because they had a license already). All the classes and variables names are short hexadecimals strings. None of the interface is idiomatic to .net (the library only has void returning methods which pass error codes as byref arguments instead of using exceptions, requesting a parameter for the length of any array passed as argument instead of reading it from the array), etc...

Basically I refused to touch this thing, using a library which makes the code unreadable is going to be a bug magnet. I would be surprised if I was the only one having this reaction to 1960s coding convention surfacing in modern code.

So selling new licenses should be a good enough reason.