Well it is really up to the gamblers whether they like to play on crypto or not,
I mean there are also some gambling sites that accept Fiat ,
But I think crypto gambling sites are in trend since it is very easy to use.
When we gamble on the gambling site that accepts fiat, we need to use a credit card or transfer the money which requires more than an hour, or it could take days before it can arrive into our account.
When we use crypto, we don't need to wait too long because by using bitcoin, ethereum, dogecoin or even reddcoin, it will arrive in less than 30 minutes so we can start playing.
The benefit of using crypto for me is because it is easy and simple for me. I only need to send the crypto which I already have or buy in the exchange and then send it into the gambling sites, and I don't have wait for a long time to arrives in my account. The other reason is that most crypto gambling site doesn't need KYC to join and I don't think it's a good idea to fill our personal information to play gambling.