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Because disposable emails are trivially used by casual users and companies see phone number as harder to falsify (correctly, IMO). It's not impossible, obviously. We know SMS can be hijacked and spoofed, but the casual user won't be doing this, today.

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If the point of requiring an ID is to prevent abuse, why do I care about what casual users are doing? What I care about is preventing signups from people who want to abuse the service, but presumably making things harder on casual users doesn't work toward that goal.

Still, it raises the bar.

But why phone? Why not something more specifically set up for the purpose, like Google authenticator or 2fa keys?

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