IP blocking the UK is not enough to comply with the Online Safety Act

That’s actually how it works? Unless you have an extradition agreement, or military overmatch, or you are willing to expend some diplomatic leverage, you are typically not getting a citizen out of a foreign country. The government complains about this all the time with goods from SE Asia, and sometimes they seize fake designer goods and make a lot of noise about it. But the people making the knockoffs just keep on making them, don’t they?

Further, you're implying this activity is NOT something that the US has historically and regularly done to other countries, including its allies in NATO?

Internet but not for any other commerce. If you sell products to someone in the EU, you are liable to EU laws about that product category and commercial activity. The internet is the only exception, and that has caused a lot of problems.

IP block is the currently the only reasonable way to apply laws to internet based commerce. It has its flaws in accuracy; but ISPs could easily create a system to make them more reliable for IP lookup. Arguing that websites cannot be regulated outside of country of origin is an insane position to take with even the minimal level of hypothetical reasoning of what that would imply.

UKs laws are dumb, but they should be free to enforce them for websites operating in the UK. And websites should be able to leave the UK to avoid complying. This is a reasonable compromise that is already how both US and EU internet laws operate.

In the overwhelming majority of cases, mobile roaming traffic uses "home routing", not "local break-out". This means it is routed to the country where the user normally resides, not where they currently are. This means:

- For people visiting the UK (and potentially staying there for a long time, if on a permissive roaming plan), their IP address won't show up as UK despite long-term residence / citizenship.

- British people visiting other countries will still be subject to OSA, even when they should not be.

- People (including British people!) who buy British AirAlo SIMs may not get a British IP. AirAlo often uses SIMs registered in a different country than the one you're visiting, and the "exit node" (P-GW) may be located in a different country altogether. I suspect this last option will become quite attractive if VPN bans ever actually come into effect.

This is pretty much unfixable without major changes in how LTE roaming is conducted worldwide, and the UK isn't important enough to make that happen.

Take this case: the law was enacted two years ago by a different government, the regulator follows the law as enacted, and yet no one cares about this little nuance.

In reality, it's a decent technocratic government trying to reverse a decade of mismanagement and fighting about five hundred fires at the same time. It's OK to good.