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Signal doesn't have to backdoor the client (although they could) to be a risk. They upload and permanently store sensitive data in the cloud protected by nothing more than a pin and SGX (https://web.archive.org/web/20250117232443/https://www.vice....) which has already been shown to be vulnerable to side channel attacks (https://web.archive.org/web/20230519120156/https://community...)

Signal seems to be quietly warning people away from the service by refusing to update their privacy policy the very first line of which is a clear lie.