I am surprised that the term “rakeback” is used because I have only seen it in poker rooms, not for casino games, where “cashback” is usually used. Rake is the amount that the casino takes as fee from the center pot of a table, but it is not used to say that such game has HE as fee.
i think rakeback means rebate for their casino, not like cashback player only can get some % back when they lost money, rebate can return some of the caisno profit depend on player total stake.