This doesn't restrict the design space that much at all.
like unified charging cable, free EU roaming or intercountry bank payments that are instant and almost free, air travel protections?
Some regulations are good, some are bad, all have second and third order effects that need to be weighed against benefits.
Do you understand how rare it is for a company to actually sell its user data?
Put this JS on your page, we'll give you some money.
"Cheap" isn't enough, especially if it's cheap through externalizing cost.
Plus, what you're talking about is a failure of socioeconomic policy, not one to be fixed by giving poor people junk.