Comment by imtringued

Your argument is bullshit. There is no content filter on this planet that will prevent children from seeing blocked content. The children that know how to circumvent the protections will circumvent them. The providers of blocked content will figure out a way around them too.

Content filters only affect law abiding users and providers. The hallmark of an effective policy is to make it as easy as possible to comply with it. Setting a header is pretty damn easy to implement and enforce by the government. It also displays trust in law abiding citizen, who will comply with the law, because they know that it serves their best interests, rather than being shoved down their throats against their will.

The alternative will have exactly the same or - far more likely - worse results, because the cost of verifying every user's age is far too high to be implemented by the vast majority of sites on the internet. It's more likely that when law abiding citizens are faced with laws that are impossible to implement that they just throw up their hands up and close up shop or move somewhere else.

In the second scenario their services might still be accessible in the UK and need to be blocked by the UK government, the online safety act achieves essentially nothing in this scenario.