For example, here's an idea for one such regulation:
If the company purchases aggregated salary data, they must publish their own salaries for at least 1 year.Then sue for copyright infringement.
Meanwhile, it is an employee-rights win that the employer can't ask for your prior salary. Which of course they now already know.
We need strong laws that protect people from companies using data. Similar to credit-data usage for loans, companies should be limited to information on an application and in an interview when it comes to making employment decisions. They shouldn't be allowed to use social-media or past employment salary, or similar. At least not without explicit legal requirements and laws governing usage.
Opt out: https://employees.theworknumber.com/employee-data-freeze
I think it should be illegal to be registered for this by employer without explicit consent from the employee, forcing employees to opt out.