They are dealing with potential security issues in china. e.g. ngzhang doesn't drive his own car anymore, doesn't use his old cellphone, doesn't live where he used to...
That's a little... uh... disturbing...
Sometimes its hard for us to remember because of the results they get, but China still isn't a westernised country in regards to accountability. The State runs the show, don't like it? Have some prison LOLpwned.
I think the concern is with rabid ppl rather than the govt...but that's just my guess.