Let’s get down to the nitty-gritty here. All slots are rigged to some degree, they simply have to be. Whether that’s “in your face” or subtle may vary.
If you take a megaways game for example there would be literally millions of permutations possible in the bonus rounds judging by all the different symbols we see.
If the reel stop positions were totally random you would need to play billions of spins to expect to hit the rtp. Then you have the chance of a retrigger which means there are potentially another few million outcomes that we are lead to believe could happen.
This tells you that the graphics are just eye candy (brilliantly done though I may add). Take the 117,649 ways for instance. I have had a few hits where I have had 6 aces on reel 3 only for the cascade to produce another 6 aces on the drop. Something that tells you the cascades are not genuine reel sets, they are simply performing a display that stops when the predetermined amount that was decided when you pressed spin, has been achieved.
How many times have you had a spin with a relatively small amount of ways, with a little 3oak win and only one or two outs, only to find that miraculously you hit every symbol you need and have 6 or 7 consecutive little wins. The true odds of that happening if it was random would be next to impossible.
As far as I am concerned no game will be totally random as in the true sense of the word. I also believe the outcome of a spin is not just simply done by weighting either.
We can use Bonanza as example for sure but don’t kid yourself any other slot is different. Bonanza gets highlighted because it has far more exposure than most other slots by some distance. Name virtually any other slot you care to mention, play it as much as you have played Bonanza and I virtually guarantee your overall results will be a lot worse.
BTG come in for a lot of stick, yet I have played games by a lot of other providers and tbh, they don’t even come close to producing the same results long term. Invest the same amount of time and money into most other providers games and you’ll be squealing like a piggy, I guarantee it!