Unpopular knowledge is that these businesses are generally illegal in their current forms under existing US law. The relevant laws are still in effect, they are just rarely enforced. The scale of the lawbreaking runs to the trillions of dollars annually, and it directly harms every US consumer.
The illegal conduct is so pervasive that even explaining the existing federal law makes one sound ridiculous, because companies have been explicitly advertising illegal behavior for decades. Because there is no sanction.
One of my faves is the notion that $BIG_RETAILER can buy in bulk and get better pricing, which they pass on to the consumer. You may have seen a company advertise something like this. It sounds like smart business! There is an active federal law[1] that explicitly prohibits this arrangement.
Lack of enforcement of that law is a factor in the disappearance of the American "high street" and the demise of many small retailers.
My #1 call for reform in the US is to simply start enforcing laws, even if doing so makes rich people/companies uncomfortable.