@aral @cancel I don't think e-mail is example of embrace extend extinguish. I think it has two other problems:
1) people mostly did not self-hosted in past (you got your e-mail adress from employer, university, internet provider or big web portal)
2) SPAM
Also e-mail is ancient protocol and tooling is also ancient.
@severak did you read the linked article? It covers your second point throughly.
As for the first point, there was a time almost all email was "self hosted". Every business that had a server had a mail server (unless they were a Microsoft only shop). Then Hotmail and then Google started the change.
@aral @cancel