But you're still relying on a law if I understand you correctly.
If the society lacks them as deeply ingrained values as opposed to somehow to getting lawmakers to force them, then they will be implemented cynically and not within the spirit of the values. The type of thing that happened with apple's implementation of the anti-gate-keeping laws 'enforced' by the eu.
What you describe requires a flexible values system - not a single semantic standard. I'd love to live in a world where if you were big enough to have people wanting to interoperate with your service on behalf of your users and you were actively preventing it, you'd be an outcast in the deepest sense. That no users would touch your service, and it would be politically unfeasible to deal with you.
We don't live in that world because people have not developed this sort of social norm.