It could certainly possibly be the Chinese government, but there's no evidence linking them and there seem to be easier ways for the Chinese to get their hands

It could certainly possibly be the Chinese government, but there's no evidence linking them and there seem to be easier ways for the Chinese to get their hands on a CA. (They already have one, and are you really willing to bet that no other CA is willing to give out a copy of their key for "law enforcement purposes" and a big pile of money?)