I'm assuming that the website still works, since it's probably the source of data for the app anyway.
At the end of the day, Apple taking down the app seems like an expected outcome, and HK is outside of the great firewall, so anyone can still access the site. What's the problem?
At the end of the day, Apple taking down the app seems like an expected outcome, and HK is outside of the great firewall, so anyone can still access the site. What's the problem?