Anyone can package an application in flatpak format and provide it for download at an arbitrary location.
A .flatpakref file is reference file pointing the the location of the flatpak.
I strongly advise anyone downloading a flatpakref; only download from a trusted source; evaluate the origin; evaluate the content; make an informed decision about trust before installing the application.
Noooooo thanks. I want stability. AUR is very often not in sync with main repos, so for unofficial packages I’d much rather use flatpak. (I know it may take more disk space but I have plenty).
Yep, exactly. Also, even on main Arch Linux sometimes the AUR package maintainers don’t always keep immediately up to date with the base dependencies, and things still break.