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Not really. It helps to have a relay that prevents giftwrap deletion by the sender, but it's not strictly required. Without it the worst that can happen is that any member can delete all messages from the relay, which might be considered a feature to some rather than a bug. Devices sync and keep the events offline and wouldn't be impacted by such deletions. But we do use relays that prevent giftwrap deletion by the sender (the recipient can still delete them), and this solves that issue. So tl;dr not strictly required but good to have.
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