I get why there's noise about banning X suddenly but lets not pretend it's for sudden technical/UX concerns. No one is calling for NYT, WSJ, or WaPo submissions to be avoided. Twitter had auth gating for many years before Elon.
> I would like a rule to avoid submissions that are login walled unless this is the primary source and an open mirror is available.
Twitter had auth gating but also mirrors; now Nitter is discontinued.