It's a shocking lack of integrity, but not surprising, given the business model. Anyway, it's disappointing that TrustPilot gets any publicity for being anything credible.
Edit: A nice little touch is at the bottom of their website that says "See what our customers are saying about TrustPilot", with a hand-picked selection of reviews... from TrustPilot! About TrustPilot! Chef's kiss.
Edit 2: This is not to say that Trustpilot's intentions aren't necessarily good, and they may even be striving to provide neutrality. But the problem is that their business model is, by its very nature, antithetical to neutrality. And of course Trustpilot is not the only review site that has this issue, but it's definitely a site where this issue is glaringly apparent.