Nearly four years old and taking up over 1,200 GB of storage space, The Commune Anarchy is probably the friendliest anarchy server in Minecraft, solely because of how close knit the community is. We're not a particularly large anarchy server (Our discord only has around 150 members), but the community is very close and friendly.
Although spawn is completely destroyed, you'll find many large builds around spawn, and there are several large megabases far out from spawn.
Join if you'd like an anarchy server where you'll find an actual community, with active bases, alliances and wars. The Commune is meant to be a small scale anarchy server, a server that still gives you the anarchy experience, without an overwhelmingly large player base, and without all of the large group politics.
IP: tca.us.to
The admin has documented the entire history of the server, and it's available to read here if you'd like: https://theanarchycommune.weebly.com/
Here's the discord: https://discord.gg/7kUmAmRag8