For those wondering "what makes it worth paying now?", GitHub briefly addresses that:
Teams who need advanced features (like code owners), enterprise features (like SAML), or personalized support can upgrade to one of our paid plans.
Teams who need advanced features (like code owners), enterprise features (like SAML), or personalized support can upgrade to one of our paid plans.
because if you're referring to requiring review approvals before a PR can be merged, that's available in the free plan (under branch protection rules).
If they mean that they're now removing required reviewers for public repos in the free plan, that's definitely a big step backward I think.
Unless i’m missing something, it should not be the same as “administrators” - otherwise branch protection rules would be fine.