If you aren’t qualified and they have to pay for every interview, either you are being honest on your application and they aren’t interviewing you or you’re lying and you open yourself up to charges of fraud because you took money under false pretenses.
If companies have to pay for every interview, I doubt they’d do as many so you’d have a hard time getting enough interviews to make that viable.
A great many things that would be good for society are not feasible to be the first/only one to do. The world would be vastly safer if there were no nuclear weapons, but in a world where other nations have them it becomes self-negating to not have them. The only way to get the social benefit of all companies doing something is to legally mandate it so there is no disadvantage.
The world of business is FILLED with people more interested in their own leisure than the company’s benefit at every level. Everyone knows about the slackers making minimum wage but every time you hear a company has hired a contractor, that’s a manager looking at the choice between A) putting in the time and effort to hire an employee, train them, integrate them into the team, and manage and support them as they do necessary work, or B) just writing a check from company funds to the contracting company and taking off early to get a few beers with their buddies, and wouldn’t you know it, somehow it seems like the answer is always to spend the company’s money.