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Why is WhatsApp so ubiquitous everywhere BUT North America?
(midwest.social)
Reminder: The terms of service apply here too.
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Maybe this is true for some regions, but in general the reason was money. SMS costs money, Whatsapp intially had a low one time or annual fee that was way below what you used to pay for a few SMS, but you got better service than MMS for that fee. And now it's free and sustained by network effects.