The US-UK Mutual Legal Assistance treaty imposes obligations on Ofcom which they have not met, 4chan claims:
“None of these actions constitutes valid service under the US-UK Mutual Legal Assistance Treaty, United States law or any other proper international legal process.”
MLAT applies only to a narrow set of legal procedures, essentially around criminal activity. I’m a lawyer but this is very specialist stuff. I’m not expert enough to opine on whether MLAT applies here but - simply judging by the quality of their respective legal work on display - I’m minded to believe that Ofcom knows what they are doing. OTOH 4chan’s rhetoric reeks of FUD.
>Lawyers representing controversial online forums 4chan and Kiwi Farms have filed a legal case against the UK Online Safety Act enforcer, Ofcom.
Drumming up public support is a no-go. Rather, I think the intent is to make the stance that if the UK wants to prevent citizens from accessing sites if they are underage, then the UK can do just that, rather than expect random companies around the world to comply.
The way the UK has chosen to do that is to ask companies to find the way that works best for them, rather than impose a single government-owned firewall solution. Those that don't will face UK fines in UK jurisdictions, which they may or may not care about.