Is this just a misunderstanding of what web 3 actually is? Or it's a way to attract people/users to make them think that their platform is more advanced?.
Well, in business, any thing to bring in or win more customers over to the company is always a go and it's welcomed.
I am not surprised though, things like this are not new, casinos can claim to be what they aren't just for the sole purpose of attracting customers, and I do not blame them, this is an industry where everyone is trying to stay anonymous but still want to get involved in businesses that does not require customers to be anonymous due to some reasons best known to them.
And to keep the business going, they have to make the customer feel that they(the business) is actually what they(the customers) want, so if it takes the casino claiming to be a web 3.0 casinos where as they aren't, it is still a business strategy.
Well, if you do not see anything special, as a user, then there is nothing special. The fact that you ask if there is something behind is already a good clue that there is nothing behind. Anyone can claim, 4D effects or Web 3.0 or Crypto-enhanced or, my favourite : "driven by AI". In the end it is about you and your experience and if it does not feel different is not different.