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That was a restriction very early on, but we've supported e-mail login for a long time. And as of today, LDAP and SAML login are now available in the base project as well (used to be paid features), so you can run a local LDAP server or SimpleSamlPhp for self-contained login.

There is also the passwordless email login method, where it sends you an email with a token to login. You can use this with any email account.

The reason a traditional "Sandstorm account" option has been skipped is I believe because they felt things like 2FA and such and other security features common to accounts like Google and GitHub would take a lot of work to implement themselves and that these already offered that.

It has also always been on their roadmap to figure out a way to do some sort of GPG login or something.

The outsourced login is the default, but it's optional. You could easily set up email/magic link based login on both Oasis and the self-hosted version.