The link is blocked by imgur themselves, not the British government (authoritarian or otherwise), because the ICO was going to fine them for historic poor handling of children's data. https://ico.org.uk/about-the-ico/media-centre/news-and-blogs...
What does that even entail? Why does a site like Imgur even need to know which users are children?
What does that even entail? Why does a site like Imgur even need to know which users are children?