Outside of the corporate world email is almost a legacy protocol. Like phone numbers we have one because we need to but do not really use it that much anymore.
I believe email was de facto replaced by WhatsApp, iMessage, Social media and OpenID almost 20 years ago.
Just ask a gen Z or Alpha when was the last time he sent an email.
Now they are gonna try to ride the wave of the Big bad tech escape but Proton has a 10 years lead here.