"What if we had a shared network on which we could all run services together"

We do, it's called the internet. I'm using it right now to send this.

And where are we now with that? The Ad centric and big tech nature of it has sort of destroyed a lot of what it was. Fair enough the value is immense but I think there's also a place for something else. Where rather than needing to start corporation's to build services we could actually do it in a different way.