Earlier quoted context omitted.
I was referring specifically to Twitter -- it's been a while since I checked, but doesn't Twitter require an email address for every account on signup? If you're offering a service that doesn't rely on email, I do see a gray area there for using SMS as a fallback; but most services I use don't fall into that category. I've even seen banks go down this direction -- banks that both require me to have an email to make a…
> I was referring specifically to Twitter -- it's been a while since I checked, but doesn't Twitter require an email address for every account on signup? I see, I misunderstood. it does not require an email address on signup, they’ve been pushing more and more aggressively to force new accounts to have numbers tied to them in fact[1]. https://mobile.twitter.com/i/flow/signup in a private browser tab in fact defaults…
My more cynical side agrees with you that the shift is probably mostly explained by data collection and user monitoring. I would like to give Twitter's security team the benefit of the doubt, or say that they're expanding into different markets and it's an accessibility thing, but... I dunno. I'm not sure I actually believe that.