A sound answer to "What is a recovery phrase?" begins with one question: who holds the keys. Coins used at a casino sit somewhere between deposits: in the casino's own account, in an exchange account or in a wallet the player controls. Each place answers that question differently. Whoever holds the keys can move the coins, and the choice of wallet decides how much of that control stays with the player and how much is handed to someone else.
The audio version
A self custody wallet is backed by a seed phrase, a list of ordinary words that can rebuild every key on a new device. Anyone who sees the phrase can empty the wallet from anywhere, and nobody can restore it once lost. Written on paper and stored offline, away from photos and cloud notes, it is safe from most attacks. A request to type the phrase into a website is a theft attempt, whatever the page claims.
Many players keep a separate wallet only for play, funded with what they are prepared to spend and nothing more. The split makes spending easy to track and limits the damage if that wallet is ever compromised. Phishing sites copy casino and wallet screens closely, down to the address bar, and a link from a message or advert is the usual way in. Opening the casino from a saved bookmark avoids most of them.
A custodial wallet, such as an exchange account, keeps the keys on the provider's side and lets the player log in with a password. Recovery is easy when a password is lost, and the provider can freeze, delay or refuse a transfer under its own rules. A self custody wallet keeps the keys on the player's device, which removes that middleman and puts the entire burden of safekeeping on the owner. Each suits different amounts and habits.
For larger balances, since it keeps the keys on a separate device that signs transfers without exposing them to a phone or computer.
Written on paper and kept offline, away from photos and cloud notes; anyone who sees it can empty the wallet, and nobody can restore it once lost.
Funding it only with what the player is prepared to spend makes spending easy to track and limits the damage if it is compromised.
Rules vary: some exchanges block them outright, some flag the account for review, and some ask where the coins are going before releasing them.
Whoever holds the keys can move the coins, so keys that leave the device hand that control to someone else.