The web as I knew it is already dead. It has been dead for years. I don't understand why the blog owner had the AI that wrote the article focus on technology like Flash vs HTML5, those had no bearing on what actually mattered, which were communities.

What killed the web was the rise of social media and social media-like sites like Reddit. No one makes a website for their hobby or game/book/movie they're a fan of, and a forum and/or IRC channel for their site, anymore. They just post about it on Facebook or Twitter, or maybe on a subreddit for it, but the sense of community that used to be part of it is totally gone. You don't really get to know people like you used to on a forum. Niche Discord servers don't have this problem as much, but they suffer greatly in terms of discoverability.

AI has made it even worse, because now you can't even be sure you're talking to a person, but in my opinion the centralization around social media was far more damaging.