I wasn’t entirely serious when suggesting to use the gambling rules but I think it still holds.
Poker doesn’t have pre defined odds of winning but it is still gambling, you can have the same thing with stocks. Or like sports betting maybe?
With the lootboxes, it’s easy: Simply give the chance of the stocks that might be in the box.
The rules are still there for the companies’ obligations.
Add betting transparency rules to the mix, like exchanges must provide real time dashboard showing all the bets all the time. No more mystery on who bets on what, are short positions closed etc.