Explaining how the fit score is defined would be great to educate free users on scoring, push them to ask themselves the right questions and raise progressively a stronger need.
I work with the growth team at Drift running and optimizing paid ads. We use MadKudu to estimate the expected value per lead. We optimize towards this value, which helps us make sure we're driving quality traffic to the site.
I own Marketing Ops and Digital Marketing at Algolia and implemented MadKudu about 2 years ago (before it was cool ;)). We are using MadKudu to prioritize leads during the Marketing/Sales hand off process. We are also using it more and more to provide our users that "Michelin starred" level of engagement.