I'm glad the article hits the central point that what is valuable about this change is the rise of the non-corporate internet. And fundamentally, what is valuable about non-corporate spaces (in my view) is that we have social ownership of them. A poster on MetaFilter has a very different relationship to their site from what a Reddit user might have to theirs.
At the same time, the corporate internet means high investment in useful centralized platforms that reduce the expertise required to publish and share something to near zero. It's not clear to me that such platforms could survive in a non-corporate setting. Maybe if they were user-owned in some material way.