WhatsApp cannot even be used from desktop without a smartphone. I think they took "mobile-first" approach too literally.
But to be fair, competitors like Telegram also do not allow registering an account from desktop app, only from a smartphone. This seems to be the new trend: you cannot sign up for Gmail and Vk without a smartphone too: for Gmail, you need to scan the QR code, and for Vk you need to install a mobile app.
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