Comment by pessimizer

All research from people who financially benefit from the outcome that they have reported should be suspect. Being questioned is not a punishment.

If you ask your child who enjoys video games to stop playing video games and do their homework, and they tell you they don't have any homework, you're silly (trying to use a kind word) if you don't apply far more scrutiny than if they told you that they had an enormous amount of homework that would keep them from playing video games for the next few days.

You don't need evidence to question this. That the reply is convenient is itself evidence. The reply is consistent with someone who is lying in order to play video games. It is not proof.