Why is prefix.cc being made a part of the RDFLib interface?

[mwatts15]

I noticed that NamespaceManager got an init parameter, bind_namespaces. One of the values for this param is "cc", which the documentation indicates that would be for getting namespaces from prefix.cc. I'm wondering what the thought process is on this: is there a feature design somewhere that I missed? I'm concerned that this website should be a dependency of this component when getting prefix.cc prefix bindings is something you can already do without any interface change. If one wanted to add prefixes from this site, they could do that themselves without cluttering the interface of RDFLib.