Maybe that is because the number of crypto poker sites is not many if we compare with poker sites based on fiat as people already know much about the poker site use fiat. They consider that crypto is a new thing for them and it needs time before they can fully understand how to use crypto to bet and search for reputable crypto poker sites. But with the growth of crypto itself can attract many crypto casinos to have poker games on their site to attract more people who use fiat to try crypto.
It's that many are still liking the traditional online poker. But soon, there will be an enormous growth in the crypto poker scene. When they get to ride the hype and be in with being cool with the usage of crypto for poker, many will jump into this ship.
It's just a matter of time that we'll see a lot of new crypto poker sites that are going to be popular, only a few we know and there's not that much tables and players are in it.