Crypto casinos are popular for fast payouts, fewer banking steps and the privacy some players want. Whether bitcoin gambling is worth it is a different question, because the coin itself adds risk: a win can shrink before it is sold, and a loss can grow if the price rises afterwards. Holding crypto is investing, staking it at a casino is gambling, and frequent crypto trading on short price moves behaves much more like gambling than many traders admit.
Some questions are not about payments at all. Most scholars of Islamic law treat gambling as forbidden whatever the currency, so paying in crypto does not make a casino halal. Legality depends on where the player lives, and many crypto casinos hold a licence from a single offshore regulator or none, which leaves little recourse in a dispute. Checking the licence, the terms for withdrawals and the coins accepted before depositing avoids most of the problems players report.
A bitcoin casino works like any online casino at the tables, but its cashier is a crypto wallet address. A deposit is a transfer recorded on the blockchain, confirmed by the network before the balance appears, and a withdrawal is the same transfer in reverse. The term blockchain casino usually means the same thing, although a few sites also run games whose results are recorded or verified on chain. Either way, the casino still holds the balance while the player is playing.