An opt-in[1] filter isn't a solution, it's a snake oil pill that has no effects whatsoever on trivial access to pornography anyways.
It will hamper a stressed kid trying to go to the local youth NGO's site with info on condoms (a true example blocked by one of the UK filters). It won't hamper a horny teenager trying to look for porn, he'll find it rapidly anyway and tell his peers how to do it.
In short, these web filters are a worse solution than simply doing nothing. You're accepting a tradeoff of real harm for imaginary, nonexistant benefits.
[1] By the way, isn't the implementation on-by-default, making it an opt-out filter instead of opt-in?
It will hamper a stressed kid trying to go to the local youth NGO's site with info on condoms (a true example blocked by one of the UK filters). It won't hamper a horny teenager trying to look for porn, he'll find it rapidly anyway and tell his peers how to do it.
In short, these web filters are a worse solution than simply doing nothing. You're accepting a tradeoff of real harm for imaginary, nonexistant benefits.
[1] By the way, isn't the implementation on-by-default, making it an opt-out filter instead of opt-in?