I'm not sure what you mean, as Gitea has SSO using many different ways, such as LDAP, OAuth2/OIDC, OpenID, SMTP, and more.

I was responding to:

> what happens when a community member wants to implement SAML for the community edition

It's surely just business model, but I was intrigued and thought that maybe there were some kind of incompatible licensing in popular libraries people use for these so-called "premium features"

Gitea would have SAML too (I'm the main author on the SAML PR to the Gitea project), but it's been held up by community reviews requiring esentially an entire re-write with another library. We'd love some help to get it across the finish line :) In open-source, money isn't the only thing that can be spent; we can also use our time.

has nothing to do with licensing and ´everything to do with business model