[jitans]

And leaking a mail (with real names) is much better?

[SahAssar]

Yes. Phone numbers are linked to a physical device (a SIM card or similar) or a contract (with a provider). An email does not need to contain a real name, and I'd say it's much easier for me to get a email with a temporary identity than it is to get a phone number for the same.

[dheera]

Not only that, but many countries have regulation that requires providing some form of government ID to obtain a phone number, even a virtual one.

[dheera]

E-mail doesn't have to have real names, isn't regulated by the government, and the same ID can be used across the world.

[throwawayboise]

It takes 5 minutes to set up a new email account just for this app if you want to do so...

[gsich]

Yes, because you can choose if you want your name in your address.