This is just bad. First of all even though the filter is optional - most large scale ISP's are rolling them out as an opt-out option. I bet a lot of people will not even find out there is such a filter. Secondly, with such ambiguous categories like "obscene" and "extremist" content that have proven to block sites that contain information on LGTB issues and helplines for abuse people get trapped in filter bubbles. People are treated like mindless zombies and it's a self fulfilling prophecy because without alternative opinions or a wide and diverse specter of information people do indeed become mindless zombies. Finally, this is the most lazy and stupid solution to the problem - does the state not want it's people to be able/learn to deal with various information that's out there (because remember - if you can't see it doesn't mean it's not there) and to think critically? Or is this a vile and through-through attempt at gagging the internet?

Bonus food for thought: remember how Tories recently deleted their internet archives... ?