What degree of control do I have over the sharing of my interview score? If I sign up for an interview with Refdash and get an outcome of "1.0/4, do not hire," is that information going to be sent to every employer Refdash works with?
Individual interview results for a single candidate vary wildly from day to day. I wouldn't want one bad day to sink my chances with a large number of companies at once; I'd much rather interview with each company separately if that were the case. Using this company would just be far too risky, even if I was 90% sure I'd ace the interview.
On the other hand, if my score was entirely private, and I needed to actively grant each company that was interested permission to view it, I would view this as a useful tool. A bad score would provide useful personal feedback for improving my interview skills in the future, and I'd be happy to send along a great score to potential employers.