This brings to my mind the following, there are some casinos that have investment options, you should know the Betfury casino well that a few years ago gave the option to buy the BFG, but at the same time caused quite a lot of returns in other crypto, including Bitcoin, what do you think about it? ...
I haven't heard about them, to be honest, but I was away from the crypto space for a few years until recently, so still am a bit out of the loop. I'll try to take a look at them in more detail when I have time.
I do like the concept of investing in the bankroll though. But despite having a mathematical advantage, there's always some trust involved, which usually puts people off.