First of all, it is worth mentioning that SMS reach is staggering. Statistically, 90% of SMS are read within the first 3 minutes of receiving, when the email reaches only ~ 10-15%. Secondly, SMS offers a much better security. SMS is tied to a phone number, so in order to see its content, users must hold in their hands a phone with a SIM card associated with that particular phone number inserted. E-mail, on the other hand, can be accessed from any PC from anywhere in the world.
Although at first glance, it seems like a meager amount, but imagine how many SMS is sent out by giants like Google, Uber or Amazon, and you'll see a different picture.
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