China doesn’t want some other overseas companies like Google or its fatherland to keep tabs on their country’s shipment. Therefore, the only elucidation left to them is to ban such websites. The same message has been conveyed to the citizens of China, that the ban was done to protect their country from the outside forces.
May 23, 2016 Huawei Ban: Trump Winning, What About Google? Oct 22, 2019 Petition · China Products Ban · Change.org
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Jun 30, 2020 U.S. weighs ban on TikTok as friction with China rises