Was he allowed to do that? Did he have any problems with the police after that? after all, China has harsh laws.
You're right, who allowed him to do that?
I don't know the context of the picture. As I can see on it, he has a QR code. I don't know it is directly a Btc address of just a payment processor with a bitcoin option.
Bitcoin is banned in China and any step related to bitcoin especially in the transaction will surely put it at risk.
Or he is against the law of China and in order to gain the support of many people he has done so.
China has come negatively with cryptocurrency specifically bitcoin. They have seen it as a threat to their people knoeing they have the most number of citizen in the world. As far as legality is concern, the guy who wore the shirt might be in jail right now, it depends on China's jurisdiction. It's sad to know that China as we expect to lead with crypto become opposite with it.
I've read they are also after on banning cryptocurrency mining.