Sources like The Guardian, Reuters, Telegraph, CNN, BBC are sometimes allowed and sometimes removed on rule 1.

The latter case is usually evident while lurking and finding a deep long comment thread. Sometimes one user there has deleted messages and there's another's rule 3 content comments left. Apparently these cases seem to usually be mutual rule 3 but it looks like they're treated differently.

Sometimes those judgement calls have allowed moderation that is at the very least poorly defined in the rules. I posted one comment complaining about a local protest about the current Palestine-Israel conflict that trashed my university's library and shuttered it for the next few months. I got a delete-ban over that for a "CHUD Opinion", which is very much not in the rules. And that is far from the first time that I've run into unwritten rules that feel like they're putting a thumb on the scales.