When Airbnb came on the scene, it seemed many (including myself) used it to make travel less expensive. But it has become increasingly popular for hosts to use it as a significant income source (also driving many cities to impose legislation against it to prevent neighborhood disruptions and rises in housing costs).
Couchsurfing.com has long existed as a more casual, unstructured option.
But are there any websites that are centered around stay swapping or a credit-based system for homestays? Such a system would seem to facilitate cheaper travel and encourage many of the positives (social interactions, organic city experiences, maximizing housing usage) Airbnb favored without some of the negatives.