Tim Berners-Lee has a radical proposition. Instead of leaving our online data vulnerable to harvesting by large tech platforms and governments, we should control it. Our own little piece of the web or “personal cloud” should need permission to be accessed. The idea sounds reasonable in theory, though in practice it’s a big ask. The internet today isn’t the vibrant, motley network that came into being after Berners-Lee first fashioned it in 1989, but a landscape dominated by huge companies like ...