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To be fair there are some positive uses for that, but being able to delete someone else's record of a conversation within the app is also very weird and easily abused. Send someone an abusive message and delete it. Delete someone's message and claim they never sent it. And so on.
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I don't use Telegram and wasn't aware of the previous iteration of this. It sounds awful. After someone has already read a message you sent, I don't think you should be able to delete it from their end without their consent. Deleting their messages on their end is even worse.
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