01 Custody
Who holds the money when affiliates get paid?
This is the part their pricing page does not answer. It says 0% transaction fee, and that is true of the plan. Automating payouts is a separate service, Managed Payouts. Their own help centre describes it. You fund Rewardful. Rewardful pays your affiliates. A 3% processing fee comes off each payout.
Neither arrangement is wrong. The trade is convenience against control.