A few companies do, including Uber. The real issue is that the American banking system is insanely slow and outdated so transferring large sums rarely is way more economical than doing small sums frequently. ACH takes 1-3 days. Push-to-debit is expensive and not universal. Cutting checks daily would be a nightmare and raises a whole other set of issues around check cashing.

People are working on this from a tech perspective, but we are not there yet. In other countries this would be a lot easier to implement because the underlying banking infra is just more sophisticated and modern.