The moment I saw the "Request a study" form on the site, I thought, "Umm, that could be a bad thing."
But to date, I have heard of only one case where it was used for less than genuine purposes. That was in the case of a "game developer" who was selling crappy asset-flips on Steam. His address information was leaked and a couple of Dubs were sent to pay him a visit. He complained about it online. (And the weird thing is, I might actually know those brothers because I lived nearby and had a few friends there.)
Have there been other cases like this? If prayers really work to attract Witnesses to your door, why does the Borg need a website function that's so prone to fraud?