I would argue that apps resemble gambling more than they resemble sugar. And gambling is banned for children and heavily regulated for adults.

More to the point, I don't think it's fair to call parents stupid. Even if parenting weren't hard (which it is) it is not fair to expect everyone to get a Bachelor's in Software Engineering to use the one device that's almost indispensable for daily life. Nor is it fair to expect parents to monitor their children 24/7.

I'd argue this is one of those problems that are so ubiquitous and so difficult to solve that we appoint people to deal with them as a full-time job in order to keep them from spiraling out of control. They usually solve it with regulation, which is exactly what the EU is doing here.