Google can't index an internet that doesn't exist. The open web is truly dying.
I believe in the open web, but it seems like an ideological position, not something most people want to participate in. (Just like decentralization!) There's a few reasons:
1. Putting things on the web means your words are public, so they can be archived forever, and anyone can look at them. Do I want employers looking at my high school blog? (Hell, mine is still up, go look it up and you'll find things I no longer believe are appropriate!) Recall that keeping posts private was an important innovation w/ Facebook, over MySpace, which was largely all-public.
2. Most people don't want to bother with hosting their own website. It costs money and requires expertise to run. And it can easily go awry (DDOS attacks! getting hacked! losing your domain!).
3. If you don't want to bother with hosting your own site, you are at the mercy of platforms that always (always!) devolve into bloat, over-commercialization, and perhaps censorship. Medium, Reddit, Wordpress.com, Tumblr - you name it!
4. Most people don't want to put the effort into writing/posting anything beyond basic food/vacation photos or whatnot. Even the people hyper-engaged in politics online are a minority. How often did people write a diary, even, before the internet. Putting in this sort of effort is not something most people want to do. I don't blame them - life's busy and work/school takes the lion's share of everyone's energy. Look at me - all I do is post comments on HN! I haven't updated my two-page static website in years!
5. It's lonely running a website! There's no guaranteed engagement, as there is with posting an Insta story or a Facebook profile picture. It really is like shouting into the void. Yes, one can join a web-ring, but you could also make your own butter...