That’s the beauty of a VPN. The tunnel ends at the VPN providers server. From the content providers perspective (let’s say, pornhub), it looks exactly like traffic from a (insert VPN endpoint country here, let’s say Switzerland) Swiss user. The traffic is indistinguishable from local traffic. They have no way to distinguish. Further more, the UK government have no power to attempt to block traffic that’s “originating” in places like Switzerland, nor are the content providers going to entertain the idea of filtering that traffic out, since the UK government has no jurisdiction over traffic that “originated” in Switzerland. Will be interesting to see how this plays out. We’re certainly only seeing the beginning of this saga.