Trustworthy. (Most FAI work is not "Friendliness theory" but instead AI architectures work that could be made more dangerous if released to a wider community that is less concerned with AI safety.)

Ah, so this explains why there is no source code visible. To be honest, I was a little worried that all the effort was purely going to (very useful) essays and not actually building things, but it is clear that it is kept under wraps. That is such a shame, but I suppose necessary.