Don't you think that all BTC casinos are just a freud?
Of course not. Most of them have a provably fair system for verifying the rolls and the top ones are all trusted. Their casino bankroll investment schemes are also legitimate as far as the top casinos are concerned and they are a good investment to allow your coins to grow, passively. Though it is not recommended for panicky investors and only considered as profitable as a long term investment.
there may be some gambling sites that manipulate their provably fair or house edge them in order to attract the players, or make the house has the possibility of winning is greater, and therefore look for a trusted gambling sites is prefer
maybe this could be the basis for you to invest in a gambling site, look for a trusted gambling sites and then you can invest in it, wait a few months then you can get satisfactory results