On "source of funds checks", the answer starts with how a withdrawal moves. A withdrawal passes through several stages before it reaches the player, and each stage can hold it for a different reason. It is reviewed by the site, checked against the account, sent through a payment service and finally credited by the bank or wallet. Most delays people report sit in one of these stages, and the conditions usually say which one.
Many sites pay a withdrawal back through the method used for the deposit, up to the amount deposited. The rule exists to stop money laundering, and it shapes the whole route: a deposit made by card may come back to that card, while winnings above the deposit travel by bank transfer. A method that accepts deposits but cannot receive payouts leaves the player waiting for a second route to be set up. The payments page usually lists which methods work in both directions.
Identity checks usually wait until the first withdrawal. The site asks for a photo document, a recent proof of address and sometimes a picture of the payment card with most digits covered. Larger amounts can trigger a question about the source of funds. Each document enters a queue of its own, so an account verified early withdraws faster later, and a blurred scan sent in a hurry restarts the wait for everything behind it.
The casino may charge for some methods or frequent withdrawals, and the payment provider or bank may deduct its own fee on top.
A quoted time normally covers only the casino's own step; wallets and crypto then take hours, cards several working days, and bank transfers pause over weekends.
Usually a photo document, a recent proof of address and sometimes a picture of the payment card with most digits covered; large sums can prompt a source of funds question.
Casinos set a minimum each withdrawal must reach, and a balance below that figure cannot leave the account by that method.
Daily, weekly and monthly withdrawal limits cap what leaves the account, so a big win may arrive in parts over many weeks.
When the account and the receiving method use different currencies, a conversion adds another cost to the withdrawal.