I love those kind of "get together and improvise" experiments. The last time I had felt such a sense of wonder and community was the first few days of Pokemon Go when everyone was in the street trying to figure it out. There's an untapped concept behind all of those. Content that is ephemeral but brings a lot of people together...
That's what /r/place was like in the first few hours, where people saw a pattern and just laid their pixel down to continue it, which is how you got things like a blue line (accelerating as time went on) and the blue corner. You as a contributor don't know what you're building, but as a group you build something.
Later as communities started planning and running scripts, it became much less "improv"-y.