> business wants it this way
Of course they want it. It's purely objective for them and purely deceptive to the consumer. Therefore, it's the perfect thing for the FTC to regulate - I mean this is what their purpose is.
Enforcement will be difficult, but I really think platforms like Amazon isn't the problem. They're a unified platform, it's pretty easy for them to enforce better review. Maybe you need to have actually bought the product, maybe they monitor product descriptions for asking for reviews, maybe they audit packages for those little "review us 5 stars!" slips, maybe they prevent modifying products, etc.
The true tough thing to enforce is little shops. You know, convenience stores, smoke shops, that type. I've been told, verbally, many times that if I review 5 stars, I get some discount. I doubt the FTC will send physical agents to check that.