>>213122417Assuming this actually happens, most of them won't.
You underestimate how little of an inconvenience barrier is needed for 90% of a userbase to disappear. Even if good VPNs were free, just needing to download it and switch it on any time you want to access 4chan would easily lead to above 50% of UK users simply not bothering to use the site anymore. Add the fact that good VPNs are not in fact free and the vast majority will be gone.