The application will stream the selected monitor if the mutter screencast portal is available. If it is unavailable, a fallback to X11 based frame grabbing will happen. As such, it should work fine in almost all setups.
AFAIK this only concerns casting TO a chromecast (or miracast) enabled device, which has been possible for a while now (the new part being the support for it in this desktop application), but you can’t make a device a chromecast receiver because that part is proprietary. You can set up your rpi as a miracast receiver or use sunshine/moonlight to stream your whole phone screen / pc monitor to your rpi, but the ability to just press “cast” on your phone and then do whatever else on it while the content plays on your TV is sadly locked behind the proprietary walls of google / apple
You can just download the app from Flathub right now and it should hopefully make its way directly into GNOME in the future. At least some work was being done to implement this directly into it.
It seems stable enough already TBH, at least from my small testing with the app. It’s more about getting things ready to be exposed in the settings app and in the system.
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