Check whether “instant” refers to casino approval or the bank or e-wallet...

https://varimail.com/articles/ethereum-casino-cashouts-why-do-some-withdrawals-still-take-hours/

Check whether “instant” refers to casino approval or the bank or e-wallet transfer; they can take different amounts of time. “No KYC” may still involve checks. Bonus wagering rules and withdrawal limits can also delay or restrict cashouts