I disagree with that, poker just isn't that popular anymore. Even existing poker sites, other than Pokerstars, are having enough trouble as it is to attract new players.
They all have a casino on the side because that's far more profitable.
Heck, that's why Pokerstars added those spin & go games in the first place, it's more like actual gambling and doesn't require a long attention-span.
Maybe it is hard for that site to attract new players but always poker has been the most played betting games,if he want to attract new players then he need to do advertising to get that players even if he got the best site,advertising is imposrtant to let know the people what we have for them,if we have that by ourself then no one will come to us.