A better question is how is whatever the UK is doing relevant for 4chan, which is an American company with no presence in the UK.

because 4chan's services are available to people residing in the UK

the OSA is ridiculous and I hope it goes the same way as the last time they tried it, but this idea that US companies should be immune to domestic regulation in countries their services are available to is silly. even if that domestic regulation is silly. because otherwise the utterly encaptured regulatory environment of the US (plus Visa and MC) solely dictates the internet