The laws of physics of a given technical paradigm determine what is viable.

The laws of physics determine the cost to build any given experience, but also to distribute it.

Laws of physics here cover things like the privacy and security model.

The laws of physics set how strong gravity is, and also the speed of light.

Even if it's possible to create a privacy-preserving, hyper-bespoke application today on a technical level, it's still not viable.

The distribution friction is too high, meaning the market is too small to justify the cost of building it.

A whole universe of conceivable software tools are below the bar of viability and thus don't get built.

No one will install an app to read about a random teenager's favorite beanie baby.

The distribution friction is simply too high.

But they might happily navigate to a random web page about it.