Never before have there been people watching the analytics and in real-time figuring out how to make their stuff more addictive.
I am also down with pointing out that the world has changed less than people think and do it quite often myself, but on the other hand, there are some real differences between mobile games and television, or even console games of the past. I do not keep my kids entirely off the tablets, but I do, without them really realizing it, keep them well away from the Skinner boxes. I'd rather just pay to buy something.
When they are older, I will have a discussion with them about this. But discussing how they work and why they are dangerous and why you need to stay away from them requires multiple concepts a 6-year-old is not yet able to deal with. (Children are not just little adults.)