"Source available" is still useful if the product in question is a library; the source can often answer questions about how to implement certain things, even if

"Source available" is still useful if the product in question is a library; the source can often answer questions about how to implement certain things, even if you cannot change anything. Source available may also enable you to debug from your code to provider code, as well as compile with different compiler options for better debugging or tracing experience. For end-user applications it makes no difference.