ActivityPub being treated as JSON is a good thing.
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Some of us are old enough to remember RSS and blogs.
Some of us are old enough to remember the absurd levels of hype that blogs and RSS attracted — similar to the modern AI hype and recent crypto hype. During that era, it felt like everyone any their pet cat wanted a blog with an RSS feed. During that era, there was a get-rich-quick fever around blogs and RSS.
Web-Browsers even added built-in support for RSS.