Congress has passed and President Obama has signed the Consumer Review Fairness Act (HR 5111 ) Electronic Frontier Foundation, link. (Oops, my post headline says "sings" when I meant to type "signs". But I guess he did "sing" it after all.)
The law takes aim at two kinds of tactics: one is non-disparagement clauses, and the other (which I had not heard of before) is clauses that try to take copyright ownership of a user review. That idea itself sounds in contradiction to existing copyright law.
Let us hope the incoming GOP Congress will have the same respect for consumers. After all, Trump’s statements supposedly supporting his own constituency are quite troubling.