What code does Durable Objects run? Where the closure analogy works and where it doesn't

Regarding Cloudflare's Durable Objects (DO), what I still don't fully understand is what code DO actually executes. I am ...
BBC

UK social media ban announced for under-16s

Prime Minister Keir Starmer has announced that under-16s will be banned from major social media platforms, including TikTok, Snapchat and Instagram. The government says the measures are part of a plan ...