ghu

Because whoever generated that chart decided to only include these. The raw data is avaiable for anyone to play around with here in csv: https://data-analysis.fedoraproject.org/

It looks like to me that the chart is coming from the ublue project, so if you are a tech person, you can fork their countme repo and modify it to your needs.

https://coreos.github.io/rpm-ostree/countme/

No, the whole point is that you expose your ip address so users in censored countries can connect to it. The proxy is between a user and a tor entry node.