This is precisely why slot machines are one of the most heavily regulated consumer devices in existence. They simply cannot and will not ever be fair otherwise. Mobile gambling (including "loot boxes") is just another regulatory capture play like AirBnB and Uber.
The money in competitive gaming is also in gambling, I gather, from having briefly worked for a company part of which did video game gambling (and the ownership structure and relationship with various tournaments was about as muddy and twisty as you’d expect—oh and their other big thing was hard-right media, including some radio personalities you may have heard of)
