There’s one main reason, although you’ll it’s not the one you’re likely going to hear. The one you’re likely going to hear will talk about human psychology and wanting to separate the smart folks from the dumb folks. While interesting in and of itself, this isn’t the reason.
The real reason is they’re trying to avoid spam filters. That’s it. There’s no psychology behind it, they’re just trying to get around the spam filter bots that are in place with texting, instant messaging, and email services.
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