It wont be closed source, after the release. "We" understand an support the open source model, as we could not have gotten to this point without that. We are just keeping it closed during the testing. Because you know someone would take it and just implement it in their coin right away. We want to have it bullet proof before we release ANYTHING related to anon/coinjoin/darksend.

 So the whole argument about closed vs open is completely irrelevant.