does switching between btc and usdt wallets make crypto casinos review withdrawals harder?

Yeah, mixing btc and usdt can absolutely slow the human review part, not because the chain itself cares, because the casino back office people do. One coin in, same coin out is easy, once you start hopping rails and using a pile of addresses you look less like a guy managing swings and more like a checkbox somebody has to clear. I see it more on poker skins than slots too, since poker cashouts get looked at a little harder anyway. Variance cuts both ways, sometimes it sails through, sometimes one bored compliance guy parks it for 12 hours and now it's "under review" and there goes your afternoon