I wholeheartedly agree. For security purpose, email or any 2 factor authentication system is better. For providing uniqueness, as already proven by the curren

I wholeheartedly agree. For security purpose, email or any 2 factor authentication system is better. For providing uniqueness, as already proven by the current market, it's easy to get a new number for free and bad actors can automate that for a price. I would say if you're doing a service where uniqueness matters, you should rely to government documents verification (eg. https://identity.stripedemos.com/ https://identity.stripedemos.com/, 1.5$ per user), which, unfortunately, we're all required to have. That said, no big tech exec will listen to this. It's not all bad, I don't really need one more reason not to use Twitter or Google.