> no past generation could stop their kids
Past generations absolutely protected their kids from cigarettes and alcohol. A gate doesn’t have to be 100% effective to have net benefits.
If one kid is able to bypass the system it means it's zero percent effective. Same thing with alcohol, and cigarettes. Especially if it means I have to show my ID to buy those things.
I'm not saying parents shouldn't try.
But like your examples, it's not guaranteed to work.
Install a DNS filter. Firefox circumvented that? Smart kid :)
Censorship circumvention might be a good skill to have in the near future.