>I'm surprised at the effectiveness of simple PoW to stop practically all activity.

It's even dumber than that, because by default anubis whitelists the curl user agent.

    curl -H "User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36" "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/diff/?id=v7.0-rc5&id2=v7.0-rc4&dt=2"
    <!doctype html><html lang="en"><head><title>Making sure you&#39;re not a bot!</title><link rel="stylesheet" 

vs

    curl "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/diff/?id=v7.0-rc5&id2=v7.0-rc4&dt=2"
    <!DOCTYPE html>
    <html lang='en'>
    <head>
    <title>kernel/git/torvalds/linux.git - Linux kernel source tree</title>

shhhh don't tell the bots !

Anubis' white lists and block rules are configurable though. The defaults are a bit silly.

The default is to allow non-Mozilla user agents so that existing (good) automation continues to work and so that people stopped threatening to burn my house down. Lovely people in the privacy community.

Sorry xe :(