Chinese people don’t use email to sign up. Instead, they use phone numbers

Phone numbers are the primary method used in Chinese apps for both signing up and logging in, not email.

• It is required by Chinese law.
  On 1 June 2017, the Cyber Security Law of the People’s Republic of China took effect, requiring everyone using Chinese online products and services to provide their phone number.
• Chinese people don’t really use email…
  During the early years of Chinese internet adoption a messaging app called QQ became the standard for communication. Chinese users essentially skipped over email and went straight to messaging.

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