Schrodinger's data is easier to put policies on.

Imagine an impenetrable box.

Whatever data and code you put in it, no signals can ever escape to the outside world.

Once sealed it can never be unsealed.

That means that no matter what happens in that box, it can't have any consequences in the outside world.

In this thought experiment, it doesn't matter what computation happens in the box.

Because nothing can communicate out of the box.

That means that arbitrary computation is safe.

Now imagine that instead there's a box where data and code can flow inside, but never back out.

The only way for information to escape is to be beamed directly into your eyeballs.

You can still allow arbitrary computation.