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Notice that as an ID and in the last 10 years it had the compete again with the phone number that has become mandatory to sign up to a lot of services like WhatsApp, Twitter, Clubhouse, Tinder, etc. to limit fake accounts.
Also digital government ID are now being rolled out so email will become less and less central for work, school applications and "real world" services.
So yes I am curious why Mozilla believe email will save them, but I keep an open mind they might have an idea.
Tailscale or having Headscale hosted somewhere else allows you to do that.
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.
Because we always assume the BSDs rejected systemd but it might just be that they were put in a situation where they had no choice.