It’s not. It’s about individual private publishers, of which there are potentially infinite. That is the beauty of the internet.
EMail is one such example: there is no meaningful way to filter spam, so the peering relationships between mail providers break down unless they each implement some sybil-proofing on their own side. The end product is that everyone is forced to use a provider like Google, and play a corporate-political game to stay in good favor with their peers. This is because there is no spam-resistance on Email application level
We've seen a similar situation this week with a controversial forum called KiwiFarm taken down by DDoS. They need to maintain a political relationship with their DDoS-protection provider, CloudFlare, who also controls a massive chunk of the internet infrastructure. This is all so that there can be a central entity that discriminates on the traffic, as there's no spam resistance features on IP level.
Imagine if Bell was touchy about letting "undesirables" use their service.