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A comment on Show HN: A journaling service that runs over WhatsApp. Parent comment

Re:Show HN: A journaling service that runs over WhatsApp by notpushkin on Tuesday September 24, 2024 @09:05AM (#41636058)
> The main restrictions are that you have to use the main device every 14 days and can only have ~4 linked devices.

I’m trying to think of a rationale and really can’t. Any ideas?

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Re:Show HN: A journaling service that runs over WhatsApp by lxgr on Tuesday September 24, 2024 @09:28AM (#41636242)
Due to the way WhatsApp does (person to person, not group) chat encryption, the number of messages scales linearly with the number of devices of either party to the conversation.

They probably want to put a cap on how much data/CPU the sending device has to expend per message.

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Re:Show HN: A journaling service that runs over WhatsApp by notpushkin on Wednesday September 25, 2024 @12:10AM (#41643586)
Hmmm. Couldn’t they just use their group protocol for private chats, too?
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Re:Show HN: A journaling service that runs over WhatsApp by lxgr on Wednesday September 25, 2024 @10:51AM (#41648212)
I'm not too sure, but I suspect that due to how they do group vs. individual message encryption, this might decrease forward secrecy somewhat.
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