Looking into "minimum withdrawal amount" comes down to adding up costs. The price of moving money in and out of a casino is rarely one number. A fee can come from the operator, the payment method or the bank, and a currency conversion can hide inside an exchange rate that looks close to the market one. Laying the parts out before the first deposit gives the real cost of every payment.
Reversing a payment through the bank looks like a way out of a dispute and usually makes things worse. A chargeback on a casino deposit tends to close the account, freeze any balance and add a debt collection claim for the reversed amount. Bonus money brings its own cost too, because winnings from it may be capped or voided if a withdrawal is requested before the wagering is complete. The dispute section of the terms explains the route that keeps the account open.
Minimum amounts turn small balances into a cost of their own. A withdrawal minimum above the money left in the account keeps that money in play, and a deposit minimum set higher for some methods pushes players toward a larger first payment. Some casinos also charge an inactivity fee on accounts left untouched for months, which slowly drains a forgotten balance. Both limits are printed on the banking page, usually in a table by method.
Many waive the fee for one or two withdrawals a month and charge for any further requests in the same month.
A few casinos charge for it, aiming at people who use the account to move money rather than to play.
Mismatched currencies can mean two conversions on the way in and two on the way out, each with a margin built into the rate.
Usually not, because a chargeback tends to close the account, freeze the balance and bring a debt collection claim; the dispute section of the terms gives the safer route.
Wallet, card and crypto charges appear in the method's own price list, not in the casino terms, so that list is the only place to see them beforehand.