Please also note that the HK police's power to ban messages violating NSL is extraterritorial. This is regardless of whether the message/intermediary/hosting/internet service provider is within or outside Hong Kong.

https://twitter.com/alvinllum/status/1280184488857710592

This link has a better video

http://www.theverge.com/2016/5/2/11564304/flyboard-air-video...