Why? That would steer already perverse incentives to interviewing at companies for practice, for free trips, etc. even further toward the employee.

Employers take huge hits interviewing candidates (namely the interviewer's time); I don't see this being a problem that needs to be solved.

That’s like a store charging you to try on the clothes you don’t buy. I wouldn’t like that.

Employers don't buy employees. That's already the law.

So...

No. It is toatally not like that and hopefully such a law will help clarify the point to any who miss it.

Such a law will also provide balances in an unbalanced power situation and enforce economic efficiencies on an inefficient process.

I'm not a lawmaker nor an employer, though, so I'll leave the suggestion for someone else to pick up.

Employers do buy the labor of employees. Think of the employee as the store and the labor as the clothes.

I've taken economics in university. I understand this line of thinking. It's wrong.

(twice, btw, once because the negative externalities of "the interview process" are not negligible, and second because the power dynamics of said process are just wrong)