What you are doing may harm other users, if they use your web service you really have bad intentions here, by paying for dishonest reviews on the Trustpilot web, cases like this are not much different from 1xBit.com, who knows how much they pay some users, misleading.

I'm pretty sure your sales don't last long, if you have bad intentions, your service will also be flooded with negative reviews on the Trustpilot web.