I can confirm betnoni has sent my 745 EUR withdrawal with BTC. They sent 0.01258029 BTC which is 658 EUR. What a "great" site.

That was high. Someone here also withdraws in BTC and fees are around $17 on the time that the user transacts.
Did you already do some computation like computing it on the rate where you request for withdrawal? No idea about when or what rate or time Betnomi converts fiat to crypto during withdrawals. Next time use other cryptos for much lesser fees in return.