It means that the display I stream doesn't show on a physical stream. When the stream start, it can automatically be set to the resolution and framerate of the client.
This is especially useful when the client has a resolution and/or refresh rate not supported by a connected physical screen. For example, I always used to have vertical black bars on my phone because it is so wide, and horizontal ones on my Surface because it is so square, but not anymore.
It also means I coult setup multi-seat stuff and keep using my pc while someone else is streaming.
All data points skew results. It's excluding data points that is generally bad, makes for cherry-picked results.
If the point is "USA and Canada bad with transit", (which I agree with btw), they should be individually present on the chart. Not some "North America" that is cherry-picked to meaninglessness.
I wouldn't say that Jellyfin is an inferior product nowadays, it is much better now, and has things Plex doesn't have like easy free hardware transcoding
You know that "until Wayland is polished enough" is at least a year ago for the overwhelming majority of people, right?