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.

Some hashing algorithms are suspectible to long password denial of service so it’s recommended to limit the length of password but certainly not to 20 characters but to a more reasonable limit, like 100 characters or so.