Despite Telegram's origins, its approach to users' security has privacy advocates worried. Perpetrators of such fraud use various marketing techniques to attract subscribers on their social media channels. Anastasia Vlasova/Getty Images Individual messages can be fully encrypted. But the user has to turn on that function. It's not automatic, as it is on Signal and WhatsApp. "And that set off kind of a battle royale for control of the platform that Durov eventually lost," said Nathalie Maréchal of the Washington advocacy group Ranking Digital Rights.
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