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It was undoubtedly the main cause of its "roots" at the beginning, but some casinos manage alternatives that traditional Fiat casinos do not manage, for example Bc.GAme has the possibility of Swap and rewards in native token, added to that the possibilities of deposits With low fees,which compared to deposits in fiat or CC are significant.
The swap feature that bc.game is indeed great and I already used it quite some a lot, mainly to exchange some BCD into some other coins. There are some fiat casinos (I know some Belgium ones) where there is no fee to deposit and withdrawal and where withdrawals are even performed instantly to your bankaccount, so that is advantage that crypto had over fiat is gone.