The UK can block whatever they want if they'd like to become an authoritarian firewall state.
But they have no legal basis to fine 4chan.
But they have no legal basis to fine 4chan.
The Online Safety Act 2023[1][2][3] (OSA) (c. 50) is an act of the Parliament of the United Kingdom to regulate online content. It was passed on 26 October 2023 and gives the relevant secretary of state the power to designate, suppress, and record a wide range of online content that they deem illegal or harmful to children.[4][5]