Parent trying to limit addiction vs. addiction-focused megacorp, and the irresponsible one is the parent who inevitably loses?

Sure. But not every parent is that responsible. The SM companies are very big and rely on ads to fill their pockets.

I really believe we need govt to step in to protect children. For example: make it forbidden to show ads to youngsters. That will take some incentive away.

How to indicate that you are clearly not a parent.