• If the internet were fully controlled, you’d need mesh networks - DIY, decentralized networks using radios, local connections, or other alternative infrastructures. I don’t know all the details, but Yggdrasil is a promising modern project that functions as an alternative “internet” for mesh networks, while also working over the regular internet.

• Within the normal internet, the most resilient solution against heavy censorship is probably Shadowsocks. It’s widely used in mainland China because it can bypass full-scale DPI (deep packet inspection) by making traffic look like normal HTTPS. There are ways for authorities to detect it, and there are counter-methods, but it remains one of the most reliable tools for evading state-level traffic filtering.

• Next in line are Tor and I2P. Both are very resilient, and blocking them completely is difficult. It’s a continuous cat-and-mouse game: governments block some bridges or entry nodes, but new ones appear, allowing users to reconnect.

• Finally, regular VPNs are useful but generally less resilient. They’re the first target for legal restrictions and DPI filtering because their traffic patterns are easier to detect.

Overall, for deep censorship resistance, it’s a hierarchy: mesh networks > Shadowsocks > Tor/I2P > standard VPNs. You can ask chatbots about any of these and usually get accurate, practical advice because the technical principles are public knowledge.