Soviet style mass apartment complexes to combat homelessness but you have to download an app to get in and out, and the app collects and sells all your data. There’s a concierge who does spot checks but they accept bribes in fresh fruit, vegetables and old N64 games.

The internets. Multiple internets, like different streaming services and you need to pay a subscription to each one to access all the websites.

Rail guns. Everyone will have a rail gun. It will be awesome.