But in the West it is expected that token political statements are to be allowed and protected. "Free HK" isn't a particularly complex political statement, and it is over a topic which Westerners think is unfairly suppressed.
A similar comparison would be if Saudi Arabia had Blizzard ban someone for saying "Don't execute rape victims."
A similar comparison would be if Saudi Arabia had Blizzard ban someone for saying "Don't execute rape victims."