It's possible, but you bring up a debate we've been having for years. I know my school of thought is that people view many sites. While we may give credit to the one they mention, I don't believe it's fair to think they only used one. For example, I don't believe it's a good practice to use a pay-per-lease model as that one source (that likely gives a $100 reward) is the only source someone uses to influence their decision to rent. I'd rather see someone pay a flat rate or in some cases pay per lead for an ILS.
All said, I do measure based on the source someone tells us or the source they use to contact us with to measure the success of the platform. Those results still tell a story, but obviously do not show an exact science for anything.
Thanks for the question!