Am I missing something here?

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Regarding rakeback on Party.
You go to their website in the affiliate section and it states how the affiliate will get 20 or 25% of their player's rake. Same as always.

So say if the affilate does not advertise in public and pays their players under the table (through Neteller, etc) and not directly from player to player transfer in Party, then how would Party ever know the affiliate is paying rakeback and would would be the problem?