I agree with all those who said it is the Parenting and NOT the game that is important.
As with everything else, it is the Parenting that is the most important element in the child’s life and not the equipment that is in the home, the garage, the park, etc. A bicycle can be a dangerous thing, if a child has the freedom to go wherever he wants whenever he wants to. So if parents set the rules and make sure that they have the type of relationship with their children that the kids know that their parents love them and respect them and they love and respect their parents AND follow the rules and guidelines their parents set for them, then you know that you are doing a great job at parenting.
Having said that, using this type of equipment for exercise, for entertainment as long as it is Kosher and age appropriate non-violent entertainment, as well as board games, outdoor equipment, gym equipment, etc. is all part of decisions that each GOOD parent needs to determine for themselves how and when they choose to use it. It is NOT up to you or me to make these decisions for any particular parent. These are parental decisions that each parent should make for themselves.