The part where they have any infrastructure, operations, revenue, or presence at all in the UK. They don’t, so the UK doesn’t have jurisdiction. This isn’t like the Apple stuff, where physical Apple products are being sold at retail in the EU/UK. UK residents are intentionally navigating to a website outside UK jurisdiction. If a UK resident goes to Mallorca on holiday, Spanish laws, not UK laws, apply because they’re in fucking Spain.
Also you should probably click that About page on the linked blog dude. Unless some American just randomly wound up at UCL in 1988 then graduated, stayed in the UK, and got a job at UCW Aberystwyth, you might want to rethink the random bullshit you’re spouting off as fact lol. By all means keep going off about how British ppl are “USians” and “US idiots” though.