It’s a vpn client on steroids that creates a VPN network (based on your provider) which you can then use to run docker containers inside of, as well as create http & shadowsocks proxies for your VPN network etc.

Comments inside the docker-compose.yml files?

That said, Fedora Legal has determined that if we collect any personally-identifiable data, the entire metrics system must be opt-in. Since we are only interested in opt-out metrics due to the low value of opt-in metrics, we must accordingly never collect any personally-identifiable data.

Looks like this statement contradicts with their goal.