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The question is how to achieve that? In today's world and as a father myself, I can tell you that it's practically impossible to control or even keep an eye on your children 24/7. Kids, if they are not out with their friends, they will stay in their rooms with phones/tablets/PCs and open access to the internet or watching TVs with all sorts of ads. How can you protect them from all this and limit their exposure to ads and content which is not suitable for their age?
Agreed, and this is the reality. We might be technology wise skilled, but they have got the ability to overcome the activities that are being used to keep them in a restricted circle. Being open to them could make them understand than learning certain things themselves. Even before the kids find an opportunity to experiment certain activities it is good to have a discussion making them understand the after effects.