The thing is that there are already so many gambling sites in the crypto market these days which already accepts so many coins.
When there are established crypto casinos which accepts wide range of coins then it becomes really hard for a new gambling site to survive which just offers their native token.
The chances are very slim and so I will recommend accepting most of the established altcoins and bitcoin.
I think the same, but "one-of-a-kind" sounds pretty interesting, so if some gambling platform comes out with new and unique games that can be very attractive. It's not easy and simple to create something "new & unique", so I guess that is a difficult part. Accepting just one coin for playing on the site is not a big issue, they can easily get some partnership with some exchange or swap service, so any deposit in any currency will be automatically exchanged for a house coin/token.
Speaking of which, when was the last time you played a new and unique gambling game? What game was it?
To be honest, I am not a fan of playing unique games. I tend to play the games which I am comfortable with.
My favorite games are dice, crash and wheel. So I keep playing these games occasionally.
Talking about the swap service then yes that's a good idea to accept multiple cryptocurrencies.
But I guess the developer doesn't want other cryptocurrencies than his native token.
That might lead to a downside since most users prefer to play with the options of multiple cryptocurrencies.