Everything they do is understandable if you think they are being honest when they say they're building superintelligence.

In this case they want to prevent a nation that censors its citizenry, puts/disappears dissidents into concentration camps for decades, and makes its own human rights lawyers literally eat their own shit, before raping and/or murdering them, from reaching superintelligence.

In this light, some client side code to potentially identify and ban the Chinese labs to slow them down by even a few days, is totally reasonable.