couple of things.
first i have played on them and actually made money. There are long rolls and short rolls
just like on a real table.
I personally think their rigged because a number of times i have seen the dice almost settle on one number
and then all of a sudden roll over like there is a magnet affect. Could be in my head, but i saw
this. Also my last trip to Laughflin , my feet were sore so i played it awhile
and had a real long roll, much longer than i had at any real table.... but the betting limits were so low
i could only make a little.
IT also provides decent comp play.
I love the bubble machine - it's how I learned the game... I still spend a couple of hours playing each trip, some of the tables can get pretty wild on the good rolls.... put in $100, roll for an hour or two, a few free beers - life is good....
I presume the OP is referring to the machine (casino) manipulating the results (magnets, whatever) to make the game something other than random.
I do not believe that this is the case.
Obviously, the players cannot influence or control the dice in any way.
I have not played bubble craps and don't think I'll start.
I Also think there is a magnet, sometimes the dice will just stop suddenly from full motion.