This turns the proxy from a transient accelerator into a time-bridging cache . It solves the problem of link rot, but introduces new ones: legal liability for serving "dead" content, storage costs growing without bound, and the philosophical question of whether a simulation of a server is the same as the server itself.
Free proxies log your data. A "forever" proxy is usually self-hosted, meaning you control the logs (and can disable them entirely).
echo "myuser:$(openssl passwd -6 mypassword)" > /etc/danted.passwd
crontab -e