Yes, but Facebook (and others) uses the Signal protocol in its optional E2EE chats, because it has withstood the test of time. But Telegram uses its custom prot

Yes, but Facebook (and others) uses the Signal protocol in its optional E2EE chats, because it has withstood the test of time. But Telegram uses its custom protocol (MTProto2) in its optional E2EE chats, which has a host of problems and has not withstood the same weathering.