Along with the expected limit bumps on Action execution time and package storage.
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.