Pulling some stats:

> The latest data reveal that more than two-thirds of the world's total population now uses a mobile phone, with the number of “unique” mobile users reaching 5.48 billion in April 2023.

> In 2020, the number of global e-mail users amounted to four billion and is set to grow to 4.6 billion users in 2025.

You can reach almost everyone on the planet with a phone number. Possibly more than by physical mail!

email is basically the next best option.

The fediverse will never displace either of these. Not even close. And that's a damn shame because the goal for the fediverse should be to get everyone on the planet connected through this medium to officially kill the proprietary social platforms