Because there is a group of Chinese people cooperating with the police, specifically targeting those who work from home. It's a collaboration between the Chinese and corrupt officers, where they let you go if you pay, but if you don't, they'll detain you to boost their performance numbers. I can't help if you don't believe me; I'm not making money from spreading rumors, just trying to caution everyone. Be particularly careful in those apartments where many Chinese reside. In any case, everyone, please stay safe.