There are some ways to earn money without paicing bets and I would like to talk about some of them.
First and the main one is the affiliate/referal programas, this way by sharing your affiliate link you will get some incom from the users bets, isn't easy to get good affiliate (users who bet a lot) but with one high roller you could make a descent amount.
Affiliate referral programs in gambling is another way of making money from gambling but is not even as easy as we thought, because it requires you to have alot of users who will gamble using your referral link and this is not as easy as we thought. Infact there is no easy way to make money from gambling, the only way I think may be easy is the aspect of owning a casino.
You are right that it is not easy to make money using Affiliate referral links. It requires you to have countless users gamble according to your referral link and the amount of income depends on their transactions. I first tried this method but it was not enough to attract ordinary users. It may be easy for those who can promote referral links through their own websites and social media or have a wide network of people with their own ideology.
The easy way to make money that you mentioned is to try to become a casino owner thats requires a lot of investment which is not possible for everyone. In fact making money without betting is not easy in general, winning from casinos or gaming programs can be a difficult way, which is mostly dependent on luck.