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.
The second one is the VIP programas, like the one that stake offers, you need to bet to grow your account, but once you have a good VIP level you will get a weekly and monthly prizes, It will be better if you bet that month but even without betting you will get something each week/month.
Referrals are just a waste of time and sometimes we have to gamble first to get the prize with a minimum of a certain nominal so actually we have to keep betting, then with the VIP program it's the same as we have to bet first and wouldn't we be lying if we said income without betting? I think it's the same and no one really has a scheme like that.