In theory, sure.
One method is an up-sale. If people find a match on a dating site, they might be interested in keeping and developing the relation. Those who hire people will probably want to manage the employees.
Actually, in these particular examples there isn't much churn per se. People don't have to leave a dating site or drop a hiring software just because it worked - sooner or later they are likely to require these services again. Then, the problem is not churn, but the cycle duration, which can be too long for a dating site, but Tinder managed to solve this by promoting very short relationships.