It&#x27;s an interesting moral line in the sand you are making.<p>Persona&#x2F;BrowserID simply reuses the concept of email address as identity (and email host as identity provider). This is honestly already pretty heavily cemented in the web (I think the war has long since been lost): almost every website uses in some way emails as natural keys for identities and with the critical overuse of email as the medium for &quot;Forgot Password&quot; login schemes, email hosts are already everyone&#x27;s de facto identity providers.<p>At least there is more personal choice involved in email hosts, and indeed sometimes direct ownership in paid email accounts, unlike the walled garden monopolies we see in Twitter&#x2F;Facebook&#x2F;Google &quot;social&quot; logins.