Yeah, you've got those products that are working at the same time. That's why I think it's better to have it all consolidated and merged into one website which is your main for your users and customers to make it understandable and easy to remember all that you've got.
But if that's the style that you think is going to work for all of your customers then good luck to you.
Your advice is one that I think makes good sense, it the first time I am seeing a casino own different sites for different games, and honestly, it won't be good for the business in the long run.
Hunnyfinance can draw examples from stake.com and several other casinos that have both casino and sports games listed, and which a puch of a button, the user can easily switch between casinos games and sports betting.
Also, OP can check out Hi, it's a defi project with their own token, they offer a full fledged crypto currency exchange, crypto staking, debit card plus gambling casino, all in one application.
I hope that OP and his team will find a way to bring all their products in one place.
I've seen other casinos do this too but that's for their other service so I think that's relatable to what they're doing. But IMO, it's really the better choice if they'll just include all of it in one website.
The casino, the token, and other products that they're offering. Owl has two websites, for casino and its token/investment. They might get some good idea on what they do but if they think that's the best for them to have it separated, it's on them.