For example, WhatsApp restricted the number of times a user could forward something, and developed automated systems that detect and flag objectionable content. In the United States, Telegram's lower public profile has helped it mostly avoid high level scrutiny from Congress, but it has not gone unnoticed. In this regard, Sebi collaborated with the Telecom Regulatory Authority of India (TRAI) to reduce the vulnerability of the securities market to manipulation through misuse of mass communication medium like bulk SMS. In 2018, Russia banned Telegram although it reversed the prohibition two years later. Some privacy experts say Telegram is not secure enough
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