For the question "How do casinos pay out winnings?", the first thing to settle is the deposit method. A payment into the account takes seconds, and the method chosen for it decides more than the speed of that first payment. It sets which way winnings can travel back, which fees apply and what limits the account starts with. Cards, electronic wallets, bank transfers, prepaid vouchers and crypto each behave differently at both ends of the route.
Bank transfers are slower to arrive and rarely declined once they are sent. They suit larger amounts, and many casinos use them as the default route for winnings above the deposit. A transfer needs the reference the casino gives, because a payment without it can sit unmatched for days. Banks may also question a large transfer to a gambling site, so a call to the bank before a big deposit can keep the payment from being frozen.
Card deposits are the most common and the most often declined. Many banks block gambling transactions by default or on request, and a card that works in shops can fail at a casino without any message beyond a generic error. Some issuers treat the payment as a cash advance and add a fee and interest from the first day. Checking the card's gambling setting with the bank before depositing saves a string of failed attempts that can set off a fraud check of its own.
A first deposit tied to a welcome bonus can lock the balance until wagering is done, delaying even a withdrawal of the deposit itself.
Without the reference the casino supplies, a transfer can sit unmatched for days before it reaches the player's balance.
Some casinos exclude electronic wallet deposits from bonus offers, so the bonus terms are worth reading before choosing the method.
Some issuers treat a gambling deposit like a cash withdrawal on credit, so a fee is added and interest runs from the first day.
No; the smallest accepted amount differs by method and is often higher for bank transfers and crypto than for cards.