> Tinder has an incentive to keep the paid users paid my making sure it is difficult for them to find a match
An evil data scientist would put almost exclusively users on your screen who you are interested in but they are not interested in you to boost your spendings and would mix a small portion of good bidirectional matches just to make his purpose less obvious. Fortunately evil data scientists does not exist... I mean I definitely wasn't paid to do anything like that. Never.