This excellent article by @molly0xfff reminded me of the sci-fi trope where everyone in the future lives in a domed bunker & gets told not to go outside because it's a wasteland filled with Bad People.
Of course the protagonists leave the dome & find that the reality is a bit different: outside can be scary, but it's not the hellscape they were told.
Big Tech walled gardens are the dome; outside them is a risky wonderland that’s ours for the taking.
