Yeah, I probably used the wrong word. I meant that the mechanism of publishing/consuming isn't centralized globally - anyone publishing a newsletter can choose (or build) their publisher, while publishing an instagram post would necessarily be produced and consumed via instagram.
Right yeah, true. Also, I probably wasn't adhering to the HN guideline please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize.[1]