A tip is meant to be a direct statement from one person to another: you made my day better, and this is my thanks. In many workplaces the money doesn't travel that way. Tips left on a card terminal, in a shared jar or through a point-of-sale prompt enter a system the employer controls. They may be pooled across a shift, split by a formula the worker didn't design, held back, or paid out on a schedule the worker can't influence.
The regular sees a gesture of gratitude. The worker sees a line on a pay statement, if the tip is itemized at all. Neither can check what was intended, what was collected and what was passed on.
None of this needs a bad actor. It needs only a third party standing between the person who gives and the person who receives.
Many tip-sharing arrangements are fair, lawful and agreed by staff. We aren't here to argue with them. TipRiver is a separate channel outside the employer's systems, where the amount is set by the regular and the destination is a named person. It doesn't integrate with any point-of-sale system, payroll or tip pool. The employer doesn't receive the funds, doesn't see them, and has no technical role in the transaction.