Crypto Betting vs FIAT Betting
So, what happens if I bet on BC.game with USDT?
Is that crypto or is it fiat since it's obviously USD? And if USDT is still crypto, then why is paying with a credit card still called paying with fiat?

You're still using a centralized solution that can freeze your money at any time for a currency with a value pegged to a fiat!
This shows that poly market is not decentralized as people think it is.
Well, unfortunately, people think of too many things as being decentralized. I'm starting to believe some don't even know what decentralization is.