Set up MetaMask if you haven't already
Buy USDT on an exchange (or receive it)
Send USDT to your MetaMask wallet
Connect to a crypto casino with metamask support
Deposit USDT
Play
Withdraw back to MetaMask

The advantages
No bank involvement
Fast deposits and withdrawals
No kyc casino options available
Stable value with USDT
Works globally

The disadvantages
You're responsible for your own security
Losing your seed phrase means losing your funds
Some platforms only support certain chains

Bonuses with USDT
A crypto casino bonus in USDT is straightforward because the value doesn't change. A no deposit crypto casino promo code in USDT is ideal. A free spins crypto casino offer in USDT avoids the volatility issue entirely.

Sports betting with USDT
A crypto sportsbook that accepts USDT is convenient. Sports betting crypto with stablecoins means your bankroll doesn't fluctuate between bets. Bet with bitcoin if you prefer, but USDT is more predictable.

Final thoughts
If you're already using MetaMask, a crypto casino with metamask is the smoothest entry point. Combined with USDT, it's the most practical setup for anyone who wants speed and stability.
I've documented which platforms support both well. Happy to share specifics.