PSA: Anyone can tell if you are using WhatsApp on your computer | TechCrunch
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While not the most dangerous leak, digital security experts say it’s not ideal situation and in some cases could help target WhatsApp.

I see the issue. The issue is that you seemingly did not bother to read the link. Since that is not what is being discussed. It is not that you cannot tell whether someone is using a PC or a phone, but rather which PC or phone or peripheral you are using if you have number of them. Your point has literally nothing to do with the post.

“Be’ery wrote in his blog post explaining the data leak that it is a consequence of the way WhatsApp is designed: When someone sends a message to another WhatsApp user, their device creates a different session key for each device the receiver is using, thus telling the sender how many devices the receiver is using.”

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