Earlier quoted context omitted.
Selectively removing negative reviews is so sleazy, one wonders if it is actually even legal. Surely there's some truth-in-advertising legislation this falls under?
Not a lawyer but I think in the US, you have the right to remain silent. I don't think a law can compel anyone to publish anything. Might be the first amendment.
Now is that illegal? I sure don't know. Is it provable? That could be tough, too. But if someone asked me if it's legal to doctor reviews of products, I'd tell them to consult a very good lawyer or two.