Repressive autocracies like Egypt, Oman, and the UAE ban Signal and other encrypted messaging apps, using national firewalls to try to block their traffic; Signal evades these blocks by using "domain fronting," in which the service"s cloud provider shows up as the origin of its traffic, forcing countries to block Google or Amazon to get at a single service hiding behind them. The cloud companies don"t like this; Google has terminated its domain-fronting service, prompting Signal to move to Amazon for its censorship-evasion cutout; now, Amazon has ordered Signal to cease using Amazon Web Services to defeat censorship or face having its account terminated.
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