Bluetooth, AirDrop and such file-sharing services are crucial tools in China, where the so-called Great Firewall has resulted in one of the mostly tightly-controlled internet regimes. In recent years, anti-government protesters have often turned to AirDrop to organise and share their political demands. For instance, some activists were sharing anti-Xi Jinping posters using this tool on the Shanghai subway last October - just as the Chinese president was awaiting a historic third term as the country’s leader.
Just saying that someone said something is not citing a source. They taught us this in elementary school.
The source is the Chinese government, @kleinheld provided the link, everyone can easily verify that.