Ask HN: Why can't we regulate industries to open their code?

what are some of the difficulties that companies face from being forced to give a licensed copy of the code to the end user? It doesn't have to be open source but just viewable or modifiable by the end user. How will that harm the proprietary software? Business still can't use it for free as it is not open source. Legal liabilities? I think those are important and for the good.

Of course it can't apply to everything so maybe any code running on a piece of hardware you purchase also gives you an individual license to modify, view or update the code?