I think it is smart to invest in bitcoin casinos.But do your own research first,and chose casino that is best to put your money in...You can invest in bankroll,or in casino savings account...If you want you can gamble with your profit or save it .Either way,you will earn passive income...
Bankroll and Casinos savings are better options for passive income. Only thing is that invest int he reputed ones only where you have some safety that your money would not be going for a toss and you will have a peace of mind. Also have some diversification and od not invest 100% of what you have in it.