Like I said, I don't think it's an issue at all, so not worth wasting any resources that could be spent on other, actual issues.

I mean how are you going to solve it? Can't trade with family? Can't trade with people who's primary residence is within 1 mile of yours, since you might be friends? Need to check a box on every trade certifying that you don't know the guy from Adam, and have no relationship with him?

The problem is that it's a total non-starter to use "motive" as a basis for trading policy. Whatever scheme you come up with has to apply equally to everybody, and I suspect the unintended consequences would be worse than the problem supposedly being solved.