https://www.reuters.com/article/us-china-internet-clubhouse/clubhouse-app-blocked-in-china-added-to-great-firewall-users-activists-idUSKBN2A81BH >Access to U.S. audio app Clubhouse was blocked in China on Monday, users and an anti-censorship watchdog said, ending a brief window that allowed thousands of mainland users to join in discussions often censored in China.