Yes, you are right. Moving the toy was an option in order to make it easier, if the movement is randomized and controled by the casino software would be ideal for them, since it would decrease the dependence of the winning rate on the player's skill and make the game to get closer to an actual gambling experience.

Also, I would add another idea, they could implement different points for each ring color, for example, 5 green rings, 5 red rings... 2 silver rings but only one golden ring which is worth more crypto in winning, in case the player manages to hook it.